Average everything out and you'll get a number close to 18 which is the typical adult age in most countries. >Sexual development, ability to bear children? Mid

Average everything out and you'll get a number close to 18 which is the typical adult age in most countries. >Sexual development, ability to bear children? Mid teens for most, earlier for some. Let's say 15 >Completed puberty, full height? Mid to late teens. Let's say 18 >Finished the fastest phase of brain development? Mid-20s. Let's say 25 The average of 15, 18, and 25 is 19.3