How did we get the specific age number for Age of Consent, Age of Voting, Gun ownership, Driver License, etc.. when age is often subjective for maturity?

Question

Not a pedophile, just wondering.

In: Other

Answer 1

Military service may be related, at least in the US.

Need to make the people feel they have at least some agency, back when the draft was a thing and now, when they want to make decisions which impact them and others.