I've unfortunately suffered several losses in real life in the past few years. My last surviving grandparent passed peacefully at 92. My wife's dear mom's fight with cancer ended, too soon. A "cradle friend" was killed in an accident. Right now, I'm playing games like The Sims so I can enjoy visiting a world that's simpler for a while. That's why I have my Sims not aging until I tell them to.
I know myself well enough to know I'm the kind who could get attached to a Sim I've played for a while and be saddened at their loss.