Wasn’t sure if this was discussed at all. I know everyone’s response to treatment is different so let’s speak hypothetically here. In this scenario this hypothetical person will be one of the people who will have regrowth on finasteride. This will be the same person in 2 timelines.
Timeline 1: A man is balding for 10 years, sees he is now a Norwood 4 and decides to take finasteride.
Timeline 2: A man is balding for 5 years, sees he is now a Norwood 2 vertex and decides to take finasteride.
Would he take twice as long (or significantly longer) to see any regrowth in timeline 1 vs timeline 2? Or would he see the regrowth happening in the same amount of time in both timelines?
The timelines you are suggesting is not what we generally see. Your age and your genetics often determines the rate of change in your balding pattern and your response to medications.