Why most manga's treat late 20's and 30 as old

I keep reading so many stories where if the guy is over 26 he's being called old especially 30.. I don't get it, to me it's still considered young being 20's or early 30's. Is this a japanese culture?

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Why most manga's treat late 20's and 30 as old [Answer]

Realvnv 11 07,2020

I don't even find 40 old, so I don't understand what they're trying to do with that "ooooh 30? are you a fosil?" logic either. 1 reply

11 07,2020

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Why most manga's treat late 20's and 30 as old

being too old