We used 26–30 months-old rats as a physiological model of aging. High TrP diet improves passive avoidance behaviour of aged rats. High TrP diet prevents age-related hippocampal apoptosis. High TrP diet affects the expression of BAX, Bcl-2 and Caspase-3. Enhanced TrP intake partially restored CREB phosphorylation in old rat Hippocampus.