I got to see him play once at Rancho Park GC in L.A., back in what I like to call the "golden age" of the Senior Tour. This would have been around 1992. In addition to Trevino, we had Player, Palmer, Chi Chi, Floyd, Irwin, Colbert, Barber, Coody, Sifford, et al. Nicklaus was also still playing and winning, though he skipped the L.A. tournament.
Trevino could still hit any shot he wanted and he hadn't lost any of his gift of gab either 🙂