Immediately after the little scuffle, Naruto commented to himself that she was good. Whatever though.
Never mentioned he'd be just as strong in his old age. He'd still be good though, he managed to disarm Orochimaru.
Obviously, his stats have not deteriorated quite so much that most of them should be changed, barring the obvious.
Note, not saying the disarming was taijutsu though. Though both taijutsu and kenjutsu require good reflexes.
Nice to know but that still doesn't prove anything.
He was getting overpowered by Edo Hashi and Tobirama in taijutsu he hasn't shown any good taijutsu feats in his old age. Also it's quite ridiculous that his speed has gotten worse throughout the years but his taijutsu remained the same when those 2 branches are directly linked to each other.