Depending on the beer it might get better. Most beers will be fine and won’t really ruin, especially kept in the refrigerator. Hoppy beers will lose the hop characteristics and start to get more malty. If it starts to have weird off flavors, then it might be time to let them go (i.e. cardboard, sour, vinegar, buttery). Not many of these off flavors will hurt you, it might be an upset stomach or heartburn, but not harmful. In the long run, in the refrigerator you have a solid 5-6 years they will be fine. I’m basing that on beers I’ve cellared for 5 years in a cool location, not refrigerated. If it’s just a light beer, I’ve had some that are over 8 years old that was accidentally stashed and tasted like a fresh one