You won't know till you try. I was slick on the center crown for at least 10 years and thinning for about 10 more before that. I think if you throw everything at it (minoxidil, finasteride, nizoral, retin a, peels, vitamins, diet, etc) there is a chance. The question to ask yourself is "Is it worth the time, cost, effort and possible side effects for getting back some hair". For me (for now) the answer is yes since I don't have and side-effects.
I'm not sure where I stand on the Norwood scale, I suspect I went from
Norwood 5 or maybe NW6 to at best NW3 but probably NW4. So I jumped about 2 Norwood scales at best.