A 2025 systematic review published in *Health Psychology Review* found that retirement is associated with measurable cognitive decline — not only because of aging, but because the structured mental demands of work disappear. Researchers refer to this as the "mental retirement hypothesis": when the brain is no longer required to perform at career-level demands, cognitive engagement decreases. According to the review, people who held high-complexity jobs — such as physicians, executives, lawyers, and academics — show the largest gap between their career-level cognitive demands and the level of mental engagement retirement typically provides.

What it means for you

This finding is relevant to anyone approaching or already in retirement, particularly those who came from cognitively demanding careers. The research, as described in the article, identifies a risk that standard financial retirement plans do not typically address. The article notes that the decline described in the review is not considered inevitable.

Source: The underlying research is from a 2025 systematic review in *Health Psychology Review*. This story was reported by Kiplinger (https://www.kiplinger.com/retirement/happy-retirement/how-retirement-puts-your-cognitive-ability-at-risk), authored by a participant in Kiplinger's Adviser Intel program. No government or major-nonprofit authoritative body was identified as a primary source for this item. · July 25, 2026

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