Is looking youthful something you're born with?

I'm asking here because it seems like there are many people in their 30s and 40s.
In my 20s, I felt good when people told me I was handsome, but as I get older, I feel even better when people tell me I look youthful.
For those of you who look young, how many years younger than your actual age do people say you look? Also, I'm curious if you have any secrets to maintaining a youthful appearance..