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Clearly you forgot puberty, high school, and being unable to sign a contract or get credit. Having said that, to be 18 again...

I'm not american only puberty applies. So once again, I wish I was 10 again.

You can sign contracts, not go to school, and get credit when you're 10 where you live?! Where are you?

25 is when you can (easily) rent cars (in the US). That's definitely a sweet spot.

Of course until 35 you still can't run for US senate or president...

For what it's worth, you can be a senator at 30. 35 is just for president or vice-president.