This is a great beer to time test. Buy four bottles all with the same “best before date”, enjoy one today, take notes so you will remember your experience, and store the other three. Be sure to store the other three in a dark and cool space but not necessarily a refrigerator. A cold refrigerator will slow the aging, almost too much. If you don’t have a cool space buy a cheap styrofoam cooler and put the cooler in a room that maintains a steady temperature. Then every four months enjoy the next bottle; take notes and compare those notes with the others.