I think it's weird having an arbitrary minimum age to be president. I would probably never vote for someone in their 20s anyway, but I don't think there should be a legal barrier. In my country (Brazil) it's the same age, but we usually just copy US in think kind of policy. I wonder how common it's in the rest of the world.

I'm more bothered by the geriatric politicians in various democracies than I am that you're missing out on some amazing politician in their twenties.

The UK has a practical minimum of 18 for Prime Minister (technically there is no minimum but practically there is) but realistically never elects a PM under 40.

For British Sovereign there is also no limit, any particularly young Sovereign has effectively delegated to a council of regents historically. In practice this is also unlikely - although in theory of course we are two untimely deaths from a 12 year old taking the throne.

The US could really do with a maximum age for Presidents, and a retirement schedule for the permanent government on the Supreme Court.

There should absolutely be a minimum and maximum age. Preferably an IQ test as well.

Between 35-60 at start of term, IQ above 130.