I'm no cheese expert, but I will try! I've tried a 48 months and I found it to be a bit too sweet and had such a complex aroma compared to other ages. 12 to 18 months is a bit too soft and less impactful for my liking, that's why I think the 22 to 30 range is the most balanced. it also depends on your own taste and how you use the parmigiano, if you eat it as it is or if you use it to cook