Why do some people think 30 is old?

Anonymous
I have seen many young, attractive looking women who are 40 and don't have any wrinkles or noticable grey hair. If you still look young and 30 is only 1/3 of a person's lifespan, how is that seen as old? I am a young adult (24) and I think anything under 40 is young, because a lot of people still look youthful up to that age.
Why do some people think 30 is old?
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