Psychology explains why your grandfather can't sit still doing nothing. It's nothing more than a defense mechanism

For some retirees, retirement is not restful at all: it can trigger death anxiety and the loss of work identity, increasing psychological distress.

Longer periods of inactivity may raise stress and cortisol, contributing to depression, anxiety, and cognitive decline.

Studies also show that older adults who stay physically, mentally, and socially active tend to age better overall.

The key takeaway is that planning the transition to retirement and preserving routines, relationships, and purpose can protect mental and cognitive health.