Had a few friends ask me recently how long did i think i could do this work for? While raising an eyebrow and asking them if they knew something i didn't, it got me thinking. I'm 51, been doing this for 10 years and have just presumed that i'd be pushing a mower till i'm 70. But when i think about it i don't see too many above 55. What's the verdict out there?? Who is the Mick Jagger out there??