One out of five men will experience hair loss by the age of 20 or 30. The hair loss increases gradually with the growing age. The early signs of hair loss are very hard to notice until half of your hair is gone. The most apparent sign is hair thinning of the temples. Another sign of hair loss is a perceptible change in hairline. When the hair becomes less thick, everyone can notice them. Hair thinning and hair loss is a permanent condition that gets worse with the passage of time without treatment.