depends on player club coach parents etc

You need to take into consideration - that he perhaps will sit on the bench and not get a lot of court time - if you as a parent are prepared for that and so is your son, then there should be no issue, but on the otherhand playing in Div 2 may develop him as a player more if he is getting plenty of court time especiallky as it sounds like he is a fairly sound player

The boys are a lot bigger in U14 as this is when puberty really kicks in. If your son was a giant in U12, he's probably small fry in U14. You'll find some kids well over 6'. Some co-ordinated, some pretty "un-co".

The game is a lot faster.

He might be the 9th player in a squad and get a lot of bench time ready for next season. He might be thrown to the wolves. Would he be better off being a star in Div 2, or an also ran in Div 1? Really depends on what you want for your son? I have seen kids gone from stars in U12 to benchwarmers in Div 1 U14, then spit next season because they weren't stars.

The coach obviously thinks he has potential, but if in doubt, talk to the coach and ask him to articulate his intentions / plan.

I think the biggest jump seems to be from 14's to 16's
This is when not only size but aggression comes into the game(yeah for testosterone)
A small skillful U12 will do well in 14's as structure of the game should still allow for a role. Often by 16's the kid that was tall early has had to develope a 3 role and that is when fighting for a div 1 spot as a bottom age can be difficult

Big jump but nothing compared to going from U36 to U38 this year. Strewth, the knees are shot, the ankles are shot, shoulders hurt and that doesn't even mention the psychological injuries.

LOL Moses,
But is that a jump up, or a jump down?

14-16 is a much bigger 'jump' then 16-18

18 to 23's is the biggest

Any jump feels like a big jump as a parent watches their child struggle with a new set of challenges and the need to develop a new set of skills. These aren't just basketball skills but coping skills (for when you are dropped from a team your mates are all in after having played with them for 4 years) or social skills as some boys start looking at girls and your kid hasn't worked out why the ineterest is there or other things related to puberty. The biggest physical difference occurs in the U14 age group. Check the stats, most boys have major growth spurts in this age bracket. They do keep growing but it is not unusual as mentioned by others to have kids over 6ft tall in U14. These same kids will play against kids 4ft something. In our squad last night we had one child shorter than the arm pits of another. The key to getting a good team together is the diversity. Having kids of different heights and playing different positions is advantageous and makes for a good balance.
Is the jump too big, for a lot of kids yes and I would not want my son to make the jump. I would suggest that there is a very small percentage of kids who could deal with this or get a benefit from it. If I hadn't watched a kid in the Sturt under 14's this last season play I probably would have said no-one should make the step, but this number 13 is really something extraordinary and did belong in Under 14 Div 1. I would suggest that he is the exception and not the norm.

dont worry about it, get him a ball a hoop, and tell him to practice. If he loves the game he'll practice and have fun, and then when ready dominate.

No not at all. The presidents kids at tigers have always done this type of jump.

Well "Interested", maybe it's time to put your hand up in Tigerland!