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Vote.
I’d also add participate in local politics. There’s no law saying a 20 year old can’t be any elected official but president.
There is, it’s the constitution. You can’t be a member of the House without being 25 or a senator without being 30.
However there exist countries with own constitutions outside of the US
Even in the US, state-level representation hardly counts as local. Neighborhoods, towns, counties, etc. all have people representing them.
It’s cool to care about and build up your community.