Wow, a year in the fridge...cool.
I've gone a week at room temp, and I have a sample that's ten days out. I'm gonna go a full two weeks and see how she acts. I bet it will be fine.
The cultures that some folks are selling appear to be dried, ground starters. They reactivate just fine... a little slow at first but after a few days of care & feeding they are happy as
pigs in sh clams at high tide.
As I've said before here, my cultures go two or three days at RT without any attention, sometimes a whole week, and after being fed, they go nuts.