All beers are at their best on the day the keg is filled at the brewery. As days go past the freshness reduces. In general, the fresher your keg draft beer is, the better it tastes. Keg beer will remain fresh if dispensing with CO2, while maintaining the proper temperature and pressure: For non-pasteurized draft beer about 45-60 days. For pasteurized draft beer about 90-120 days.
https://www.micromatic.com/how-long-keg-beer-remain-fresh
I brewed a beer once and put to much honey in it.
It was undrinkable until I aged it in the keg for 12 weeks.
I hate making beer and adding anything but barley,water,hops,yeast. Usually turns out wrong.