I keep my film always at -18 degrees Celsius.
I've been told by the most expert for film postproduction in our country, that in those temperatures, the aging of emulsion is so slow, almost negligible.
When I want to use it, I simply put stock from fridge to refrigerator for one day (when I have time ahead), or in emergency situations I just put in on a desk (+20 degrees Celsius) for a 2 hours a then load the magazine.
I have done this procedure many times and never have any issues with frozen gelatin or whatsoever.
I have stored exposed stock in refrigerator for a couple of weeks (6-8) and scanned image has been great! No lack of contrast, or anything.
Also old stock is fully usable, just overexpose it a bit.
I use to rate fresh new stock 1/2 EV slower (for better saturation), 2-4 years old stock 1 EV slower, and even older stock about 1 and 1/2 EV slower.
Film stock can easily handle overexposure. I've seen accidentally overexposed whole roll of fresh stock by 2 EV stops (wrong rating in exposure meter), and nobody in scanning room can see the difference from other rolls of project. Nothing was blown away.
So don't be afraid of older stock, just rate is slower and give it a lot of light.