As usual, I disagree.
I suspect NL is close to my age, like SocialSecurity eligible.
As such, long practice sessions and drilling, some play, can quickly lead to injuries that are hard to recover from.
If he was 50, yes, he has a great chance to get back up to at least 4.5.
At 64, no chance, it's reality, injury is the NO. ONE factor that inhibits getting good.