I suggest you write all the advantages and disadvantages of both at night without anyone interruptting you . Ask yourself , which one is more important to you ?
Anyway, just follow your heart , follow what you really want
In my opinion , the age is not a problem, if the school donot like some one who has old age, just change their minds , persuvading them : They will not regret to accept you .
Donot be subject to the enviroment , you can be the first one to change their thoughts .