14 open at the moment counting full sized bottles only (not samples and minis). Oh, and counting scotch only here. There are a few open bottles of non-scotch around but I don't go to them often.
The only one I have more than one backup of is Glen Garioch 17yo DTC because no one else wants any of that case I picked up! I have one backup of Ardbeg Uigeadail and one of DTC '81 Glenugie. The other 15 types have no backups.
What _is_ rare for me these days is the number I have unopened: 10 bottles, most taken up by the 4 backup Glen Gariochs. I've had all of them before or have another bottle open already but I have 4 bottles right now which are unopened and are their only representitive. I may save my Rosebank for spring (or may not) and am saving a bottle of '91 9yo Ardbeg to compare to Ardbeg Almost There 9yo next year. I'm sure I'll open a bottle of Bruichladdich soon but have none open at the moment (two closed).
Several bottles are just about done too. Sad state of affairs, really...
When my case of ASY arrives the average age of my collection will drop for a while.
I am certainly more the grasshopper than the ant though in some versions of the story the ant becomes the hopper's meal... any ants have any nice bottles to pass on???