I plan to age it 9 weeks. That has worked well for the last 3 that I have made. When I started (2008), I was aging for 12 wks because that is the time that I read that was proper, but as soon as I was able to get a method that would give me a good blue penetration into the paste, 12 wks was too long- too much "eating of the cheese" by the mold for my cheese size . I was however, using generic mold powder then. I began using Stilton harvested mold at the same time I decided to shorten my ageing time. I have read that blues "just get better with time" but I don't know if that includes the small "home owner" style cheeses that I make.Maybe with this more cheese specific molds, I could age longer and get a better result? My Christmas Stilton posted here was typical of my last 3 that I made and didn't know how to post. I think that is about the best that I can hope for given my skill level and equipment ect. So, after all that-9wks.