What's the relationship between finasteride use and aging?

there is no relationship between taking finasteride and aging. Finasteride is a DHT blocker that can slow the progression of hair loss. It does not speed up or slow aging. 

Aging happens naturally and oragnically and we can't do much to stop it. Finasteride is a medication use to reduce DHT for prostate and hair loss concerns.  

There are no studies that I am aware of that implicates finasteride in the aging process. Eating a healthy diet, low in processed foods are associated with greater longevity.

Finasteride does not cause aging. There are many side effects and aging is not one of them but people who take it do age normally as you are probably doing