Hereditary hair loss
Treatments may help
It hardly seems fair that your friend still has a full head of hair while yours seems to keep getting thinner. Fair or not, your genetics are some of the most prominent contributors to hair loss, especially for men. And as hair naturally becomes less dense over the years, patterns of hereditary hair loss (androgenic alopecia) tend to become increasingly visible.
Hereditary hair loss with age causes few complications — except for appearance and an extra risk of sunburn or perhaps chilliness in cold weather. But appearance can be a big deal, and just because it's common doesn't mean it's easily accepted. Hair loss, though frequently dismissed with humor, is often keenly felt.