What age do you have to be to be considered old?

Many of generation z and Gen alpha says anyone born 1990 or before. Some are saying before or at 2000.

When I was their age, I probably would have said born in the 1960s but now I would say anyone born before 1949 because my grandmother was born in 1949 and still healthy and vibrant.

I don't feel old. But I guess to teens and some young adults I would be old.

But I feel like these guys said, you're not really old until you start feeling old.

youtube.com/shorts/whJ4REQ6JJ0?si=aZe_em9HQTZxndZ1
What age do you have to be to be considered old?
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