Younger people, what age do you feel is old? For older people, do you feel old yet at your current age or does the bar move as you get older?

I just hit 45 a few days ago and I feel like I'm getting old now. 50 seems to be my benchmark at the moment. Maybe that changes when I get there.
Younger people, what age do you feel is old? For older people, do you feel old yet at your current age or does the bar move as you get older?
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