Research points to the effectiveness of “effortful learning,” which combines mental and physical exercises.
Exercise is good for the aging brain. Indeed, the right kind of exercise can protect against neurodegeneration, the natural decline of brain functions that accompanies aging.
You could encourage your older clients to play “brain games” on computers or mobile apps. Alas, multiple studies say this approach helps only with the specific cognitive functions the games use (Bamidis et al. 2014). Hence, a computer game that requires a lot of visuospatial processing tends to improve visuospatial processing—but not much else.