If a person is in their 40's are they considered young or old?

Just middle-aged ( in between the old age and the youth )

Depends whether you ask a 20 year old or an 80 year old.

Depends on who you ask and when you ask.

Nowadays, with life expectancy pushing into the 80s, 40s is literally middle age.

Sixty years ago, the youngsters at the time thought 30s and above old; the same people today, old and retired, think that 40s is still young.

Also, there is a societal tendency to "infantilize" people: treating teens as children, young adults as teens, and so on. So, people in the 40s tend to be seen as in their 30s, despite the early signs of aging.

A type of question that will get different answers. I think it is probably considered younger than it was than when my grandparents were in their 40s. When I was in my 40s I considered myself young.

I hope young lol

They are considered middle-aged.