My four unbred 10-year olds (2.2) are all of similar size, but my 19-year old is a male & a good 5'+ as well.
Similar thing with my unbred 2.2 Florida rat snakes, but with them, there's a logical reason: every year, both females lay infertile eggs- about 2 dozen in the first
clutch, & far fewer in the 2nd clutch. The gals waste so much energy producing all those eggs, they stay way smaller than the males. The males are just about 7',
while the females are only about 5'. My corn snakes, so far, haven't churned out infertile eggs, which accounts for their staying a similar size to the males, and I
hope they never do that as problems can arise (egg-binding).