Hey mick, I had a double inguinal myself at 47. In the months before my surgery I went into a pretty intensive abdominal routine to help speed recovery and ease the pain. It worked wonders. The doctor was amazed when I walked in 48 hours after surgery feeling great. At the time I was a pretty hardcore whitewater paddler, so yeah, I took it easy. You want to give everything time to heal. That said, you'll know. Your body will tell you if you're pushing it.
And remember, before they put you under tell the nurses it's bigger than it looks....it's just that you're both a little nervous

. I'm sure they haven't heard anything like that before.
good luck!