The age for Male Pattern Baldness varies tremendously across the patients. Some of the men start their hair loss as teenagers or as young adults, and some begin to have hair loss on their forties or fifties. Female Pattern Baldness age differs as well. Most of the time, we see it during/after the pregnancy, traumas (physical and mental), or during menopause. Scientists think it is due to the hormonal imbalances that happen during these stressful periods.