Androgenetic alopecia, or genetic hair loss, can start as early as the teenage years. Key signs include excessive hair fall and a widening part. This happens because hair follicles shrink over time. To slow down hair loss and promote regrowth, you can use treatments like minoxidil (Rogaine) or finasteride (Propecia). Additionally, it's important to maintain a well-balanced diet rich in vitamins and minerals essential for hair health.