Wow. This one got resurrected I see. I don't necessarily think at 11 and a half there is a magic mph number you 'must' be at. But I do think youth baseball makes the huge mistake of trying to teach control first. Control can be had at a young age with poor mechanics. To p velocity can not be had at any age with poor mechanics. Keep in mind before responding that there are of course a few freaks of nature, let's keep this the the vast majority. Also some of what we call poor mechanics in mlb is nit picking at that point. Pretty much all those guys have good mechanics. So I would say it is never too early to teach your kid to develop powerful mechanics and throw hard. You want to measure that via radar I am fine with that also. But never ever sacrifice velocity for control.