TLDR Finasteride increases hair count in middle-aged and elderly men without causing sexual dysfunction.
This study was a double-blind, placebo-controlled clinical trial conducted on 28 men between the ages of 53 and 76 with both benign prostatic hyperplasia (BPH) and androgenetic alopecia. The participants were split into two groups - one given finasteride 5 mg daily for 24 months and the other given a placebo. Hair counts showed that there was a gradual increase in hair count in the group receiving finasteride while the control group had a slow decline from baseline. The difference in mean hair count between the two groups was statistically significant at all points of time, indicating that finasteride can improve AGA in middle-aged and elderly men. Additionally, there were no reports of sexual dysfunction during the study.
Cited in this study
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23 citations
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July 1993 in “Pharmacotherapy” Finasteride treats enlarged prostate and baldness, but may cause limited urinary improvement and sex-related side effects.
January 2021 in “International journal of dermatology, venereology and leprosy sciences” Most adult women experiencing hair loss are aged 21-40, with the most common type being female pattern hair loss. Trichoscopy is a useful tool for diagnosing different types of hair loss.
August 2018 in “Oxford University Press eBooks” The document's conclusion cannot be provided because the document cannot be parsed.
January 2015 in “프로그램북(구 초록집)” 
6 citations
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November 2006 in “Journal of Cutaneous Pathology” Two teenage brothers had a rare, treatment-resistant form of female-pattern hair loss with unusual scalp changes.
30 citations
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December 1999 in “International Journal of Dermatology” Finasteride increases hair count in middle-aged and elderly men without causing sexual dysfunction.
187 citations
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June 1999 in “Journal of The American Academy of Dermatology” Finasteride effectively treats frontal hair loss with few side effects.
581 citations
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October 1998 in “Journal of The American Academy of Dermatology” Finasteride safely and effectively treats male pattern hair loss, but may cause reversible sexual issues and harm male fetuses.
