Mid 50's. I haven't noticed any increase in recovery time from injuries or illness so far.

I went through a period in my 30's when I'd get sick with a cold in October/November and stay sick until March. I think more than anything else it was just catching every bug the kids brought home from school, and just going through a series of overlapping illnesses every year. It stopped when I hit 40.

One thing I'd point out is that we never really recover from an injury. Our bodies are just in a perpetual state of trying to hold everything together.

Lack of vitamin C will result in Scurvy. One of the effects of scurvy is that scars from injuries and surgeries just open up again. I interpret that as your body not being able to fake it anymore.

If you're having trouble healing, maybe eat an orange ;-)