Re: Why isn't Old Spock hanging out with nuSarek?
There is a deleted scene in ST09 when nuSarek encounters Spock Prime. However they don't actually meet face to face, IIRC. We don't know if they ever did meet; although since Spock Prime was so adamant about not giving his younger self any details about his future (as we saw in STID), I doubt it. Spock Prime probably uses a pseudonym.
"If the world was perfect, it wouldn't be." - Yogi Berra