Hi and welcome to SR, I am the mother of a heroin addict.
If you read the stickys above and read any and all info you can regarding addiction you will be able to answer alot of your own questions.
regarding your age, addiction doesn't care and neither do we. Addiction attacks anyone and everyone.

knowledge is power keep reading and good luck there are so many very smart people here that can give you so much guidance and support that you won't know what to do with it all.

Dealing with addiction (if you so choose) is a long process.

welcome to S.R. there is alot of info here if you read all the post & read the stickys at the top of the forum."what addicts do". he is an addict & he is the only one that can help himself.you cxan not do anything to make him quit.they will not quit for love.you can not love the to the point it makes them quit. my son is my addict & i love him more than life but it does not change anything.the 3cs helped me alot.i did not CAUSE it, i can not Control it & i can not CURE it. it only gets worse till they decide to get clean.it is a long hard battle with an addict.some never change or quit.keep coming back,find a naronon meeting in your area.they help alot.there is support there & lots of caring people here also.prayers,hope