Today is my 30th birthday and a perfect time to reflect on life, the universe and everything.

Despite being female and thus held to tough and often unrealistic physical standards, hitting the end of my third decade doesn’t cause me anxiety about either my appearance or place in the world.

In my experience, age is not an amount of time but a state of mind. As a child I always wanted to be a grown up, so I acted like one. It freaked my parents out sometimes, but that’s just how I was. In my mind, I still feel pretty much the same in that regard. I love to work hard and I thrive in positions of responsibility. Since both these traits get more important with age, I have actually enjoyed stepping into the adult role I’ve always felt I belonged in.

But that’s only one part of me.

In many other ways I’m as juvenile as ever. If you spend much time with me on Twitter (@summertomato) you’ve probably noticed I have the sense of humor of a 12-year-old boy. I blame my dad for that one. I’m also still shocked every time I hear that friends my age are getting married and having children. In my brain we’re not nearly old enough for that yet! But in reality, it is my friends who are normal and I’m the outlier.

Oh, and did I mention I’m still in school? Up until a couple years ago I carried a backpack with me everywhere, for better or for worse.

All these things give me a sense of agelessness, so it is hard to think of this birthday as anything but another day to do things I love. But part of my peace of mind certainly comes from the fact that I’m in pretty good shape physically–probably the best of my life. And at 30 this is definitely something to be proud of.

Summer Tomato readers know I attribute my good health almost entirely to my eating habits. I also spend a good amount of time in the gym, though I don’t workout nearly as much as I used to. But healthstyle extends to more than just diet and exercise.

Here I’ve compiled my favorite 30 habits to slow aging and keep you young in more than just your heart.

30 Healthstyle Tips To Keep You Young

1. Be happy The physical damage caused to your body by stress has only recently become appreciated by the scientific community. Fill your life with things you love and get rid of almost everything else. Practice stress relieving activities like meditation and exercise, and learn to appreciate joy when you find it. Happiness does a body good.
2. Eat vegetables There is good evidence that oxidative damage caused by toxins and metabolism contributes to the aging process at a cellular level. Foods (but not supplements) high in antioxidants seem to protect us from oxidative stress.
3. Avoid sugar Sugar is a direct cause of aging and significantly reduces lifespan in organisms from yeast to primates. Not by a small amount either.
4. Moisturize The appearance of your skin is largely dependent upon moisture. Help it out by using moisturizers to keep your skin soft and hydrated. Work with a professional to determine what type is best for you.
5. Don’t raise your eyebrows Credit my mother for teaching me this one, it has been a lifesaver. As a kid she used to warn me about raising my eyebrows, saying it would give me wrinkles and I’d regret it. I thought she was crazy, but still learned to express myself without much forehead crinkling. As a result I have far fewer forehead lines than some people years younger than me.
6. Sleep For me the most important determinant of how I look (and feel) on a given day is how much sleep I get. Seven hours is my ideal, but everyone is different.
7. Eat fish Some evidence suggests that the omega-3 fatty acids found in fish are particularly beneficial to the skin.
8. Wear sunscreen I love the sun and spend as much time in it as possible, but I never walk out the door without sunscreen on my face. UV radiation from the sun damages your skin and promotes aging.
9. Don’t smoke Smoking is one of the easiest ways to look older than you really are and shorten your life at the same time. Avoid both primary and secondary smoke like the plague.
10. Step out of your comfort zone Mental exercise seems to be one of the key elements of quality aging, but this doesn’t mean you should sit around all day doing crossword puzzles. Neuroscientist and cognitive aging specialist Dr. Adam Gazzaley suggests going out of your way to challenge yourself mentally, doing things like traveling and learning new languages even over the age of 60.
11. Take vitamin D Some research suggests that vitamin D may be particularly important in slowing the aging process. The jury is still out on the value of vitamin D supplements for aging, but they seem to have enough other benefits that it’s worth the investment.
12. Eat fruit Like vegetables, fruits have an enormous amount of antioxidants and help with hydration. Vitamin C in particular is thought to benefit skin.
13. No foundation or powder makeup Generally I avoid putting any makeup directly onto my skin. I realize I have a very flexible work environment and this is not possible for every woman, but skipping the makeup does help maintain your skin’s hydration and elasticity. I do wear makeup occasionally, maybe once or twice per week. But in general I find that mascara and lip gloss are enough for most situations.
14. Hydrate Your skin is very sensitive to water levels. Stay hydrated by sipping water and eating fruits and vegetables throughout the day.
15. Whiten teeth I know this isn’t something you can find at the farmers market, but when you drink as much coffee and red wine as I do, minor (and admittedly superficial) fixes like teeth whitening can go a long way. If you don’t believe me, try and remember the last time you saw a 20-year-old with yellow teeth….
16. Wear sunglasses If you’re a happy person (and I know you are), your wrinkles will most likely be caused by smiling and show up predominantly around your eyes. Block out extra sun (and look super cool) by always wearing sunglasses when you go outside.
17. Eat beans and lentils Legumes are a fabulous source of minerals that can help keep your skin hydrated and looking young.
18. Tea Afternoon tea time is one of the greatest discoveries I’ve ever made. Not only is tea full of antioxidants and other cancer-fighting compounds, a midday break can be just what the doctor ordered to sip away stress.
19. Cardio I’m not the biggest believer in cardio exercise for weight loss, but it is still important for vascular health. Not to mention how awesome you feel after a good session. Cardio doesn’t need to kill you, but you should do it regularly.
20. Strength training Building strong, toned muscles is one of the most effective ways to look younger than your years. Ask anyone who looks fabulous and they’ll swear by strength training. A little goes a long way.
21. Eat intact whole grains Intact grains (not fake “whole” grains that are ground into flour) are an excellent source of vitamins, minerals and soluble fiber. They are also perfect fuel for those killer workouts.
22. Olive oil It is hard to think of something more versatile, healthy and delicious than olive oil. It breaks my heart that dietary fat got such a bad rap the past few decades, since the benefits of healthy fats like olive oil are innumerable. Fat isn’t just “not bad” for you, it’s essential.
23. Kill your television We all have things we enjoy watching (I’m partial to NBA championship teams), but if it takes up a significant amount of your time each week (>5 hrs) it may be time to reevaluate. How many years of your life do you really want to spend on your couch?
24. Don’t stuff yourself Cutting back on calories is the single most effective way to slow aging and extend life. I don’t advise starving yourself, but it’s a good idea to avoid overeating in any situation.
25. Eat nuts Nuts are the perfect snack food and are filled with anti-aging fats, vitamins and minerals. They are also great for suppressing appetite–just don’t eat more than a handful.
26. Avoid dairy Studies of aging skin have shown that milk and milk products are associated with acne, which can lead to scaring and age spots.
27. Avoid processed meats Processed meats are associated with many different health problems in humans. No need to get too hung up on this, but you may not want to eat deli meat every single day if you want to stay young.
28. No processed carbohydrates Just like sugar, processed carbohydrates are a direct cause of aging and disease. I eat these things occasionally, but don’t let it happen too often.
29. Coconut oil Fats come in all different shapes and sizes, and I try to incorporate a good mix of all of them. Medium-chain fatty acids like those found in coconut oil are starting to be recognized as important by researchers, but the evidence is limited. Coconut oil is also a healthy source of saturated fat for vegetarians. I always use coconut oil when cooking Southeast Asian food.
30. Red wine Red wine has a powerful anti-aging compound in it known as resveratrol. Though it is unlikely that the dosage of resveratrol in red wine is high enough to impact lifespan, drinking alcohol in moderation is also associated with decreased risk of heart disease and other vascular problems. Cheers!

Do you have any anti-aging secrets?