First of all, you have a wonderful profile. GMAT stellar. GPA stellar. Founder of a small racing team. Amazing.
As for your age, don't worry about it. You could easily apply at 29.
The big question is: To round three or not to round three? and in your case: A resounding YES!
You are already applying to three schools now, and if your essays are good you will likely be accepted to at least one. So that means that if you don't apply to H/S/W now, you might just take your accept without ever figuring out if you would have gotten in. So, your chances are less good, but since you are already going for it this year, pull the throttle loose and let her rip.
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