When is someone no longer "young"?

Not necessarily "old", but just not "young". I've heard discussions on podcasts about people in their mid to late 30s being told that they're "still young".

For my part, I recently changed my Facebook profile picture and a longtime family friend commented "A handsome young man". I thought "I'm 36 years old." I'm as far removed from my childhood now as my parents were from theirs when I was a child. Bon Jovi's song It's My Life, released in 2000, is now playing on classic rock radio stations in my area (Jon Bon Jovi wasn't much older than I am now).

For the record, I'm not lamenting this at all. But when is someone no longer considered "young"?

When is someone no longer "young"?
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