I've been using Rogaine since 30 or so. I have hair loss associated with autoimmune disease. It must be used daily or you lose the hair you regrew. It took a good 6 months so see a significant different in my hair.
I agree with CurlyPearl... I don't think you shoul use Rogaine for what you want. I would stick with good nutrition, biotin, fish oil, maybe msm, and treating your hair and scalp well.