Yes, the younger you are, the more agressive your hairloss will probably be but the studies on finasteride tell that it works best on people with lower norwoods so i don't know which study you have looked at but that is wrong.
In my opinion OP should start looking for a more aggressive protocol like dutasteride, oral minoxidil and maybe a topical anti androgen. Because he does have extremely aggressive hairloss. Start with an aggressive protocol and keep your eye out for newer treatments. And i know blablabla we said 10 years ago there would be a cure but here are a lot of new promising treatments in the pipeline right now. (Pyrilutamide, GT20026, Verteporfin,...)
Your hairloss would have probably been waaaay worse if you didn't start medication and you always could have started with more effective treatments and maybe that would have stopped your hairloss dead in its tracks.
There are so many people that started a hair loss prevention protocol in their early twenties and stopped their hairloss from getting worse for a long time. Look at Derek from mpmd, Kevin Mann, MGK and Ashton Kutcher for example. They either kept all if not most of their hair when starting treatment or even got regrowth are still maintaining that regrowth.