My son has an asthma when he was like 1-2 years old . Right now thanks God its already gone. My question is, is it really true that asthma will come back when your older ?

Yes, it is possible. There could be months or years with no attack and you might think you're totally well, but there will come a time that it might be triggered by something to recur. So always be mindful of what your child eats and his activities to avoid any further attacks.