Overall, the results suggest that age is not reliably associated with individual differences in intertemporal choice tasks in adult samples; i.e., old age doesn't make for more patience

Seaman, Kendra L., Sade J. Abiodun, Zöe Fenn, Gregory R. Samanez-Larkin, and Rui Mata. 2020. “Temporal Discounting Across Adulthood: A Systematic Review and Meta-analysis.” PsyArXiv. June 30. doi:10.31234/osf.io/7ysxa

Abstract: A number of developmental theories have been proposed that make differential predictions about the links between age and temporal discounting; that is, the valuation of rewards at different points in time. Most empirical studies that examined adult age differences in temporal discounting have relied on economic intertemporal choice tasks, which pit choosing a smaller, sooner monetary reward against choosing a larger, later one. The picture obtained from such studies is largely inconclusive due to a heterogeneity of results. We contribute to clarifying the current status of various theories of age differences in temporal discounting by conducting a systematic literature search and meta-analysis of adult age differences in intertemporal choice tasks. Across 37 studies (Total N = 104,736), we found no reliable relation between age and temporal discounting (r = -0.081, 95% CI [-0.185, 0.025]). Exploratory analyses of moderators found no effect of experimental design (e.g., extreme-group vs. continuous age), incentives (hypothetical vs. rewards), amount of delay (e.g., days, weeks, months, or years), or quantification of discounting behavior (e.g., proportion of immediate choices vs. parameters from computational modeling). Additional analyses of 12 cross-sectional data sets with participant-level data found little support for a nonlinear relation between age and temporal discounting across adulthood. Overall, the results suggest that age is not reliably associated with individual differences in intertemporal choice tasks in adult samples. We provide recommendations for future empirical work on temporal discounting across the adult life span.