No regrets:

*How to Age Well: Scientific American*

From the article:

…So, as we age a more effective strategy is to let go of the things we’ll
have little opportunity to fix. For those who haven’t adopted this adaptive
strategy towards missed opportunities, learning to do so may help improve
their emotional well-being. Brassen and her colleagues suggest that their
findings could be applied to an age-appropriate cognitive-behavioral
therapy regimen that would help the unsuccessfully aging disengage from
regret inducing experiences.