August 2018 in “Journal of The American Academy of Dermatology” The study concluded that a new method can effectively assess scalp sun damage in balding men, which increases with age and sun exposure.
The man has patchy hair loss likely due to alopecia areata.
May 2014 in “Japanese Society of Anti-Aging Medicine” 
April 2012 in “Journal of IMAB” Men with male pattern baldness don't necessarily have high levels of Dehydroepyandrosterone-sulfate, and there's no link between its levels and the severity of hair loss.
3 citations
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November 2020 in “Journal of The American Academy of Dermatology” The document suggests that more research is needed to confirm if baldness can indicate a higher risk of severe COVID-19 in men.
152 citations
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October 2010 in “Archives of Dermatology” Finasteride helps hair growth but may cause sexual side effects.
September 2005 in “Archives of Dermatological Research” Large prostate patients more likely to have hair loss.
December 2016 in “Int J Genet” Male pattern baldness is partly caused by specific genes, but most genetic factors are still unknown.
November 2013 in “대한피부과학회지” Eating habits may affect the duration of male pattern baldness.
10 citations
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October 2000 in “PubMed” Androgenetic alopecia affects many people, impacting quality of life, and treatment focuses on reversing hair follicle miniaturization.