Is he too old for me?

that's the same age difference between me and my bf, but it's the other way around (I'm almost 18, he's almost 16) so two years isn't a big deal, but with the description you gave i don't think age should be the biggest deciding factor here, but a matter of life style (ex: his drinking and smoking are not exactly healthy for someone your age to be around, I've dated some older 'bad boys' and they ended up choosing drugs over me every time)