Guys are indeed losing hair earlier than their fathers. Four trichologists who spoke to the Times of India say while it’s normal to lose 50 to 100 hairs a day, more than that could indicate a health issue. Consider that the body typically sheds hair in response to extreme mental or physical stress, with hair loss that shows up several months after the event.
The benefit of having a thick head of hair is that the top of your head stays protected from UV rays. But once your hair starts thinning and you begin to lose that protection, you’ll find that your scalp is more susceptible to sunburn. If you’re not spending more time outdoors than usual and your scalp is becoming more sensitive to the sun, you could be losing some of your hair.
In males over 60, androgen receptor and aromatase levels were low and comparable in scalp with and without thinning in both frontal and occipital regions. The 5a -reductase type 1 and 2 levels were only slightly higher in males with thinning hair in both frontal and occipital regions, but the differences were not significant. Histologic and hormonal findings suggest that senescent thinning is a diffuse process that is histologically similar to Androgenetic Alopecia, but hormonally different and may not be entirely androgen dependent. 

Stress: It’s no secret that stress can cause hair loss and an increase in the stress hormone cortisol may make you more likely to suffer from conditions like telogen effluvium, which causes more hairs than normal to fall out, or trichotillomania, a psychological condition in which a person pulls out their hair, like as a nervous (or stress-induced) habit.
In men, finasteride (originally marketed as Proscar) is approved for hair loss associated with androgens. In one study, 62% of women also taking oral contraceptives containing the synthetic progestin drospirenone reported improvement. So it may be effective for female hair loss in the setting of increased androgen. But studies are limited and it is harmful to the male fetus so should not be used by women thinking about becoming pregnant or who are pregnant.
Finasteride (Propecia) is used in male-pattern hair loss in a pill form, taken 1 milligram per day. It is not indicated for women and is not recommended in pregnant women. Treatment is effective starting within 6 weeks of treatment. Finasteride causes an increase in hair retention, the weight of hair, and some increase in regrowth. Side effects in about 2% of males, include decreased sex drive, erectile dysfunction, and ejaculatory dysfunction. Treatment should be continued as long as positive results occur. Once treatment is stopped, hair loss resumes.[30]
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