I think 25 is the begining of oldness.

30+

Depends on the person. There are people that at 20 don't feel any longer young and others with 30-35 years still think/act like much younger people

when you don't know anyone in the top 10 on Billboard

35+

Really depends on the person.

I still feel young so it's older than 28 at least

.

im 20 somethings and i still feel im stucked on being 15..
but i do feel like an adult when i needed to be

I guess it depends. I'm 22 now & I feel great and youthful. However, when I turn 26, I could feel old and run down. So, I guess it varies.

It depends on the situation you are referencing and the state of mind. Like if someone dies at 40 people say omg he was so young that is sad. But if you try to play at the mcdonalds play place at 22 suddenly you're an old pedofile who need to get out before they try to call the police even when you try to tell them you just want to feel young and live a little! and then the cops get called you get tazed and it's super awkward.

It depends on how the person feels I would say.

65 and up I'm 25 and I feel really young. Young is when if some dies at that age and people say OMG they were so young so 40-50 is young to me.