Does Finasteride Work Well If My Balding Is Caught Early?

My genetics are solid (everyone has full heads of hair except my paternal grandfather and maternal great grandfather) but, like everyone else, I can’t be sure that I’ll never develop MPB. I’m currently 21. I identify heavily with my hair. Can I rest assured that if I catch MPB in the bud early, I can expect myself to keep my hair as if I never had MPB in the first place if I keep taking it?

Finasteride works well in men under 25. The younger you are, the better it works, especially if caught early. 21 is an age where I would expect good results.