You've done well to be feeling 50 up to now! if you dont already (and you probably do to have felt so young) take up some gentle exercise like swimming.
And keep posting and using your brain!!!
It made me sad seeing my nan lose her capabilities but she was ok right up to 83, it was only the last 3 years that her mental capability went down, and i think that was because she couldn't see to read.
Here i am giving advice and im only 30! lmao
Im sure you know it all, and im sorry you are feeling your age. my dad feels older than he is - bad back, and my hubby too (he used to play rugby and has sports injuries). i get scared when i think of getting old and i have years left (hopefully)
its so sad that the WTS give people false hopes.