In reply to Timmd: Unfortunately the other thing which Big Ron, Stevie Haston and Rab Carrington have in common, apart from their age, is that they are all blessed with a sublime natural talent which 99% of climbers don't have, and, they have an inherent physical conditioning which is the result of decades of climbing at the highest levels - which yet again is something 99% of climbers don't have.
I'm the wrong side of 50, and I'll be buggered if I can get remotely close to the level I used to climb at.
Eventually, the body just won't do what the heart and mind want it too.
As for London Wall, most people fail because they spend to long trying to stitch it with gear. If you're going to succeed on it, you have to either move fast, or have fingers like skyhooks