I hear what you're saying, Jeff. I hate De Niro's mugging in Meet The Parents. And I think he and Pacino both phoned in their performances in Righteous Kill. Pure tosh.
I wouldn't use the phrase 'past their prime' perhaps, but I think Richard Jenkins (64) is a pretty classy actor and even when Meryl Streep (62) is in more lightweight roles, she still brings her 'A' game...
Actors like Jeff Bridges (62), Morgan Freeman (74) and Tommy Lee Jones (65) are pretty darn cool, too.