Hey there,
I am 36 am use the Kamagra jellies only for the fact that when you do get hard it makes it seem much fuller.
For me, the best thing I used was cabergoline - it seemed to make my cock feel fuller, harder and I could keep going even when I came as it blocks the "right I am done now" chemical from your brain. It also didn't come with any headaches that I get from Viagra or kamagra....only thing is, is that it is very hard to get hold of...
Maybe you could try herbal things like dragon lights (they used to work pretty good) or super fly spray that will numb you a little...(and you do only need a little bit of this stuff)....
My local Chinese herbal place is always advertising Chinese male tonic as a sub for Viagra.