Male pattern baldness, the most common cause of hair loss and balding in men, can begin at any age, but it generally starts between the ages of 25 and 35. However, some men may experience signs of hair loss as early as their late teens or early 20s. The likelihood of hair loss increases with age, and by age 50, approximately 85% of men will have significantly thinner hair. The following chart shows the percentage of men with noticeable hair loss at different ages:

• Age 20: 20%
• Age 30: 25%
• Age 50: 50%
• Age 60: 66%

While hair loss is more common as men get older, it can begin at any age and varies from person to person. Genetics is the primary factor that determines when and how much hair a man will lose. Other factors that may contribute to hair loss include hormonal imbalances, medications, and medical conditions.