I taught my father to climb poles when he was in his mid fifties. He did fine.
As for the same trench, think of the potential. Can you imagine the fun power would have playing on all the equipment attached to your phone lines? If you had them in the same vicinity and an auger or digging attachment was able to contact both entities at the same time you would have power playing with your puter, your telly, and your phones.
If gas was in there, hmmm, sparks and fuel, sounds like a real party.
This is along the line of the logic of running your waste and water supply lines in the same trench............