There is a myth that the cellular deterioration that occurs throughout life and growth affects brain plasticity in the same way and with it the learning capacity of people. This belief profoundly affects the expectations placed on the capacity of adults, who see how these are reduced both by the people around them and by themselves many times.
However, there are articles that show learning ability and brain plasticity in the elderly. For example James et al., (2020) concluded that “piano training in elderly musical novices may induce functional and morphological brain plasticity in the auditory and prefrontal cortex, hippocampus and elsewhere in the brain, as well as in long- and short-range white matter tracts and functional connectivity, together with concomitant cognitive and sensorimotor advantages, even at an advanced age.” (p.4)
Pascual-Leone, A., Amedi, A., Fregni, F., & Merabet, L. B. (2005). The plastic human brain cortex. Annu. Rev. Neurosci., 28, 377-401. https://www.annualreviews.org/doi/full/10.1146/annurev.neuro.27.070203.144216#_i1
Mallart, L. P., García, R. F., Racionero-Plaza, S., & Sordé-Martí, T. (2019). Socioneuroscience and its contributions to conscious versus unconscious volition and control. The case of gender violence prevention. AIMS neuroscience, 6(3), 204.
Racionero-Plaza, S., Ugalde, L., Merodio, G., & Gutiérrez-Fernández, N. (2019). “Architects of Their Own Brain.” Social Impact of an Intervention Study for the Prevention of Gender-Based Violence in Adolescence. Frontiers in psychology, 10. https://www.frontiersin.org/articles/10.3389/fpsyg.2019.03070/full
James, C. E., Altenmüller, E., Kliegel, M., Krüger, T. H., Van De Ville, D., Worschech, F., … & Grouiller, F. (2020). Train the brain with music (TBM): brain plasticity and cognitive benefits induced by musical training in elderly people in Germany and Switzerland, a study protocol for an RCT comparing musical instrumental practice to sensitization to music. BMC geriatrics, 20(1), 1-19. https://bmcgeriatr.biomedcentral.com/articles/10.1186/s12877-020-01761-y