I think you have a decent sized dick, and at 40, the gains are going to come hard and slow.
(not that your old, its just that your body has probably stopped its natural growth in that region)
If you want to try PE, get the good stuff for pumping and Jelquing, but dont expect to go to the local porn shop and spend $29.95 for a pump.
Use the tools listed in the PE forum of this board.
C