It seems that when you have been for a pee there is a certain amount of urine left in the uretha, this needs to be coaxed out by gently sroking the scotum upwards towards the penis.
When you were younger this was not a problem, a quick shake and all was dry, but as you grow older the muscle tone goes and without the prostate and the sphincter at the bladder neck some work is required to get rid of the last few drops.
I would think that this is part of the problem you are referring to. The stroking works for me and I have been told by my prostate nurse that this is what she suggests to her patients.
All the best from England.