Is 40 considered old for a man?

Question

I'm 35 years old so I'm just 5 years away from turning 40 years old.

Is 40 considered old for  a man?

Answer 1

No. 40 isn't old at all. I'd say old is past 100. There's 111 year old veteran and he acts like he's younger than 50.

Even 111 I consider him to be young.