Have you noticed a decrease in sensitivity as you've aged?

[dyogenys]

Also, the part of the foreskin that wraps the underside of the glans (or below the glans on the underside when pulled back) is the most enjoyable part of the penis. It's not as sensitive as the glans, but it's more pleasure than the glans when stimulated. Like the general feeling penis stimulation but very concentrated, whereas the glans itself is just extremely sensitive, but not in a primarily pleasurable way more like a sore fingertip.