“我老了”用英语怎么说

I'm past it.

I'm over the hill.

I'm not as young as I used to be.

I'm getting on a bit.

I'm the wrong side of 30.

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Oh, you are 36, you don't look a day over 28!

Don't worry, you're only as old as you feel.

Q: What was your best age? Which age do you enjoy most and why?