Grit: The Power of Passion and Perseverance · chapter 5 · id grit-c5-01-grit-can-be-developed-and-grow

“Grit can be developed and grown over time -- it is not fixed. Older adults show more grit than younger adults.”

contestedconfidence: high⚠ extracted by pipeline, re-audit pending

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Duckworth et al. (2007), JPSP 92(6)DOI registry: valid

Grit scores were higher among older adults in cross-sectional comparisons, suggesting grit may increase with age.

Rimfeld et al. (2016), JPSP 111(5), 780-789source alive

Grit perseverance is 37% heritable (95% CI: .24-.42) with no shared environmental influence. Approximately two-thirds of variance is explained by non-shared environmental factors.

This claim is a stable, citable object. If you can falsify a verdict, tell us — corrections are loud here.