Ageing is not just a linear physiological decline (see L. Fontana et al. Nature 511, 405–407; 2014). Research into its more positive features could lead to a better-quality and longer life.
Personal resources such as optimism, resilience and engagement are integral to ageing well (see, for example, T. D. Cosco et al. BMJ Open 3, e002710; 2013).
Investigating the contribution of psychosocial strengths to positive ageing in human models would provide further insight into, and complement, physiological animal models.
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Cosco, T., Brayne, C. & Stephan, B. Focus on positive features of ageing. Nature 514, 35 (2014). https://doi.org/10.1038/514035e