baldness

Why does hair on both temples shed excessively?

Why does hair on both temples shed excessively?

VnExpress
I am 42 years old, recently experiencing significant hair loss, with noticeable thinning on both temples. Is this a sign of baldness? What are the causes? (Hoai Phong, Ho Chi Minh City)
Baldness at 19

Baldness at 19

VnExpress
Hung, 19, has experienced hair loss for a year, with noticeable thinning and baldness from his forehead to the crown.