A 21 year old president does not have a fully developed brain
On 22 May, Ireland will vote in a referendum on a proposal to reduce the minimum age of a president to 21. This is not a good idea because the human brain’s frontal lobes – critical for good judgment – are not fully wired to the rest of the brain until the mid twenties on average. This is why insurance premiums for young drivers are so high. Presidents have to have good judgment. Most 21 year olds don’t yet have it.