怎样保持年轻、抵抗衰老？

What are the key steps to keep staying young?
保持年轻的关键是什么？

获得509.5k好评的回答@Peter T Mayer：

Can you guess the age of this Singaporean man? (Answer is at the end of the answer.) Looking at him, most of us would think that he is around 25 years old, right? He is in excellent shape and has the face of an 18 year old.
你能猜出这个新加坡男人的年龄吗？（答案见文末）看看他，我们大多数人都以为他25岁左右吧？他身材超棒，还有一张18岁的脸。
When asked how he can still be in such amazing shape and what are the things he needs to do daily to stay young he shared his secrets:
被问及他身材怎么保持这么好以及他永葆青春每天都需要做什么时，他分享了秘诀：
1.“Good diet that involves eating a chicken breast every day.”
1.“良好的饮食，每天吃一块鸡胸肉。”
2.“Regular workouts (we’re talking four times a week).”
2.“定期锻炼（我们说的是每周4次）”
3.“No late nights.”
3.“不熬夜。”
4.“He also avoids taking a shower early in the morning or late at night.”
4.“他也尽量不会太早或太晚洗澡。”
You Will Never Believe How Old This Singaporean Man Is
你永远不会相信这个新加坡男人的实际年龄
OK, so here is the answer:
好，下面揭晓答案：
He just turned 50.
他刚满50岁。
No, I am not kidding!
我真没开玩笑。
 

获得126.9k好评的回答@Margaret Weiss：

Here are some practical things which work for me.
以下几件事在实际生活中对我都很有效。
●sunscreen
●防晒霜
Daily. Apply liberally. Right after moisturiser.
每天都涂，涂得要够多，擦完保湿霜就涂防晒。
●moisturizer
●保湿霜
Apply before going to bed and first thing in the morning (right after shower).
睡前擦，早上一起床就擦（洗澡后）。
●drink water
●喝水
Not in gallons but in moderate amounts.
不要喝太多，适量即可。
●have good friends
●交几个好友
At least one - but a really good one. Spend time with them. Laugh with them. Support one another
至少要有一个，但得是真正的好朋友。和他们聚聚，一起开怀大笑，互相支持。
●...marital status...
●婚姻状况
This one is a personal choice.
这个视个人情况而定。
●keep your mind alive
●保持思想活跃
This is where having a child definitely helps: kids ask all kinds of questions.
在这一点上有孩子就有很大帮助：孩子会问十万个为什么。
●exercise
●锻炼
Even simple walking will do.
甚至简单地走一走都有用。
●be self-sufficient
●自己动手
Calling a handyman is easy, yet sometimes it makes sense to learn how to do things on your own around the house.
找勤杂工很容易，但有时自己房子里里外外的活学着干一点也很有意义。