Just thought I'd share the amazing story I heard a couple of weeks ago. I was at a wedding with BF who was best man so I was stuck just chatting with random strangers (didn't know anyone there except BF and the bride and groom). One couple I was talking to were very much into hiking/mountain climbing. They travelled all over the world hiking up big mountains. Both were in their 70's. They had also taken up downhill skiing at the age of 50. Both looked super fit and healthy. Turns out the husband had had a stroke only a year ago, quite a severe one. But just this summer he had made it up to his first mountain summit after the stroke. It had taken him a lot longer than it used to (though still quicker than I've ever been able to), but he was very excited to be back. And he was now ready to go skiing again (though his wife had decided she was now finally too old) as they were off on a skiing holiday this winter with the kids and grandkids.