You are right that age has caught up with him but this will still go down as one of the greatest sets ever seen at Glastonbury, few performers can bang out hit after hit like Elton, or play the piano like he does, he is a master showman.
He did im still standing really well and I don't want to take anything away from him but the band is absolutely incredible, his piano is perfect just wish he could still do it.
You're right though if you're in the crowd you're absolutely loving it and it will go down as 'historic'