if it's androgenetic alopecia, a raw food diet will only help slightly, and you'll still probably go bald. This is because of the reduction in testosterone that is sometimes seen in those who eat a lower calorie, raw food diet. You might save yourself time, but probably no more than a few years imo. Diet has very little effect.
There's plenty of raw foodists who have lost most of their hair. Check them out on youtube.
I eat a mostly raw food, low calorie diet (CRON), and have had thick hair all throughout my 20s, but just last year I noticed slight thinning on the sides of my hairline, and average decrease in ponytail circumference. It always changed between 3.5-4 inch depending on seasonal shedding and other factors, but my hair was around 4 inch for many years. It was just over 3 before i started finasteride. And yeah, finasteride has really thickened my hair up all over. So even though my hair was still normal thickness, I think it's best to catch it early.