On average, people lose anywhere from 50 to 100 strands of hair per day. Hair loss in older people is a common issue — 70 per cent of men experience thinning to some degree by the age of 50. Image Source: Getty
If you've noticed your hair thinning on your upper scalp, the most likely cause is male pattern baldness (MPB) which is an inherited condition. It starts sometime after puberty because of the involvement of the male sex hormone dihydrotestosterone (DHT).