Hi. He may be suffering from early onset androgenetic alopecia. Do you or his older brother or maternal uncles have balding? This could genetically predispose him to balding. Further environmental factors , pollution, stress, junk food and poor diet could cause you to lose hair further. He'll probably need treatment with hair care lotions or serums - something that has vasodilator properties and improves thickness of hair and reduces hair loss. He needs to have a good balanced nutritious diet. Yes his hair density can be restored if he takes timely treatment and care of your hair. See a dermatologist near you. Hope this helps. Let me know if you need any further assistance in this regard. Warm regards.
Health Tips
No need to be depressed - the problem needs to be tackled with medication and conselling