What do old people really feel?

Even at the age of 33, I feel so sad that I don't feel attractive or energetic and I just wish I was in my early 20s and hot again.

I cannot imagine what I will feel like in my 40s or 50s...

Is it because I was an inexperienced and unhappy young man?

What do people who are in their 40/50/60s feel about this?
What do old people really feel?
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