Is 25 years old still young?

Is 25 years old still young?
The United Nations defines youth as persons between the ages of 15 and 24 with all UN statistics based on this range, the UN states education as a source for these statistics.
I've always teased people on and over 25 as "old", and in a few months I'll reach that age, thus joining the "old people". I already have some grey hair lol.
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I lamented to my friend that soon I'll be 25, and that I'm feeling the old age creeping up on me.
She said it's not so bad, and I said - "You are wise, grandmother".
She's 34, and now she won't talk to me.
Is 25 years old still young?
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