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[Meatball]

It is quite true that the vast majority falls between 15 and 25 when it comes to having the maturity level expected of an adult... but there are some rare individuals who fall outside of that....

So you're agreeing with me, but demanding a perfect system of idenifying maturity in outliers?

Unrealistic.

Age is our single best identifier of maturity without doing a rigourous psychoanalysis on every subject, all the time.

Generally, a 20 year old is more mature than a 15 year old. Generally, a 15 year old is more mature than a 10 year old. Generally, a 30 year old is more mature than a 20 year old. This is simple stuff, and while I don't have any sources, I'm sure statistics would fall on my side.

Edit: On that note, how do you quantify maturity?

Edit again: If you can't identify a maturity gap between a 1 year old and a 3 year old, this discussion is over.