Is 61 too old to take up gymnastics? Not if you’re planning on living to 100

The older I get, the more I want to play rather than just work out. Have I left it too late to learn a backflip, cartwheel or forward tuck – especially with a dodgy knee?How do you know when it’s time to slow down? I’ve been wondering that ever since I decided to live to 100. Sure, I may not make it; but if I do I expect exercise to play a huge part, alongside a healthy diet and (seriously, kids, this really isn’t rocket science) evidence-based medicine rather than wellne