I reckon around 43 I was super fit and active like you (except my adrenalin was surfing). Ten years later, I've fallen off my literal bike a few times (ouch), had an SI joint injury and now a hip injury where I can't surf at all, even though I feel fit enough! I'm 54 and fuck I hope i"ll still be surfing at 60. You might be a little different at 60, but let's hope you are still shredding in some way! Go you, girl - I mean, you kickass amazing woman!