I'm 22, I started using minoxidil 18 months ago twice a day. Can I use minoxidil for life?

At first I had alot of very thin hairs and, slowly gained good results, then I gradually cut it off. when I tried to reduce it less than once every two days my hair started to thinning, only some of the haris not all. knowing that I developed late in about 17 or late 16. and all my family father side and mother side fully and greatly bearded does this mean I'll eventually have a beard? Can i really use it this rate for life?