Probably not fixable. As noted, no reversing male pattern baldness. Alopecia areata where it comes in patches, usually just results in baldness despite treatment. Some fungal infections can cause baldness in localized area. See a dermatologist but not liking his chances.
Rogaine early and often. It has helped a wee but woth me, but probablybhas just prevented further lessors than anything. At his age, it is pribabky just genetic, not swimming related
