Im 53, about a stone overweight, active in that I walk my dog and generally am always on the go plus have a fairly physical job. I have always been one to do stuff myself in the lifting/shifting sense...but over the last year I seem to have so little strength or stamina. Just 5 minutes of digging the garden leaves me physically tired. I don't look forward to gardening like I used to, its always been my passion but Im feeling like I can't cope with it these days 
Surely this can't just be age related?? I see other older people at the allotment digging away happily, yet I seem to have run out of steam at 53?? Im sat here now after half hour tidying in the garden and I feel utterly physically empty. Any one similar??