My hairline is thinning out as I get older

Even when I was young, my hair density was average and my strands were thin, so I had some slight parting issues in my twenties. But now that I'm in my mid-thirties, when I look in the bathroom mirror or in bright sunlight, I notice my hairline is quite sparse ㅠㅠ There's a lot of empty space now. On windy days like these, as soon as I step out for a bit, my hair splits apart and looks a mess. Propecia is the answer, right?