The older you become, the more expensive unnecessary resentment gets.

Resentment costs the same amount of attention regardless of your age, and as the years become fewer the proportion it takes rises. Some grievances are genuinely worth holding, and many are simply old and kept out of habit. What makes them expensive is not the anger but the space they occupy in a life with a finite amount of it. That calculation quietly changes over time.

Pick one long-held resentment and ask what continuing to hold it costs you now. Not whether you were right, which you may well have been. Just what it takes, and whether that is a price you still want to pay.