Patchy moustache and beard growth can occur due to genetics, age-related hair development, hormonal factors, or certain skin/nutritional conditions. Masturbation from ages 19–23 does not cause permanent beard or moustache thinning. Sexual drive can also vary naturally and is not necessarily related to facial-hair growth.
Next Steps
Consult a dermatologist/physician if the growth is significantly patchy, has recently reduced, or there are smooth bald patches. They can assess whether hormone or nutritional testing is appropriate.
Health Tips
Maintain a balanced diet with adequate protein, sleep and regular exercise. Avoid self-starting
testosterone, Ayurvedic medicines, or multiple supplements without medical advice.