I had animals that were heavy breeders live for around 5 to 6 years. I'm sure if they weren't breeding so much they could've lived a little longer, but you try and stop them... Output of eggs was normally a clutch a week, but that sometimes turned into a clutch every 4 days or so. Egg count is typically 2, but with my older females they would start laying 4 after a few years. The eggs did get smaller, but were just as healthy. I tried drying them out to stop them, but then they just ended up hiding the eggs better in more humid parts of the tank. I just kind of gave up on trying to stop them and let them go nuts. They bred best for me in a colony in a 50 gallon cube, but that's just me. I never had great luck with pairs alone.
Best,
Justin