When I bottle I use mostly 12oz bottles and 4 or 5 bombers. The bombers almost always take longer to carbonate and seem the age at a much slower rate.
I bring this up because I brewed a batch of Coffee Stout and while I have been drinking the 12 oz bottles of this very tasty brew I opened bomber yesterday and WOW - it was green! tasted very young.
I just found this interesting.
Grinders Island Brewery - Pipeline
145 batches and counting
West Coast Blaster #4 almost go and on tap and a Dbl Chocolate Stout aging/carbing. Brewing East India Porter #4