Controversial Batfamily Opinions

[Tzigone]

Damians official Height is 4'6'', and that fits with how he is usually drawn, thats roughly the average height of a 10 year old, and about 8 inch shorter than an average 13 year old.
It is of cause possible that Damian might just hit puberty extremely late, but if his development is otherwise normal he would probably end up beeing something like 5'0'' as an adult.

And when it come to Tim and his generation, they are all 16 or 17, most people are pretty close to their final height at this age.

I agree. Yes, occasionally someone has a late growth spurt after 18, but it's not common (and more likely in boys than girls, of course, because they start and finish puberty/adolescence later) to gain more than a couple inches then. And Damian is really an issue. They really didn't have him grow between 10 and 13 and, IMO, that's when you take kid to the doctor to make sure everything is alright.

Kon makes more sense if they'd never had him get as tall as Supes in adulthood. Initally, he wasn't actually a clone of Superman, and we didn't know his human donor or how tall he was. Even with Lex and Clark contributing the DNA, sometimes kids just turn out shorter than their parents. I could make an exception for an atypical late growth spurt, if it didn't happen to so many characters.