Some use it and some don't. If ypur estrogen is controlled right you likely will experience great libido and hard one and won't need it. Estrogen too high or especially too low and viagra won't even save your dick
Dylan gave you a great stack. Look at your diet as well as your training. That will have a big impact on your body and keeping it from breaking down. I'm 50. You don't need to fall apart in your 40s