I've never heard that age has an impact on how long you stay. And I would think that 47 would be on the lower end of the scale. We have members here into their 70s. Overall health is a factor for sure on recovery time.
My surgeon's standard was that as long as I was up walking every couple hours and could drink enough water each hour, I could be released after 1 night. As Lisa said, it's crazy how different surgeons are with their own programs and requirements.