Three Things About Thinning Hair:
1. Rule: The less hair you have, the less hair you should have. As your hair thins, the longer you let it grow the worse it looks. You don't need to shave it, but keep your hair short, especially the sides. A size 2 or 3 on the trimmer looks the best.
2. Rogain works, much like going to the gym. The gains are very slow and gradual, but if you stop using it, all progress is lost in like 3 weeks.
3. Women don't care. Seriously, don't fool yourself into thinking you need hair like a 12 year old. As long as you keep what you got groomed well, you will be just fine. The short 5 o'clock shadow facial hair look still balances out short thinning hair on top quite well.