Who hasn't hit a few balls short with no warmup?
He looked stiff.
I won't make any claims of what he can or can't do, but age gets everybody, some sooner than others.
Just like when EVERYONE said Jack would never win another major after 1980 when he was 40, he won one more, the '86 Masters 6 years later.
I believe Tiger can win another, but I don't know if.