I have nic that's been in the freezer for nearly 3 years and it's still good. I just recently dug a bottle from the bottom of the freezer that was stamped 2014, and it was tasteless, clear as water. Freezer storage extends the product life almost indefinitely from my experience.
I only store my Nicotine in a dark cool place with no refrigeration and have had nicotine that was stored for over a year be exactly like it was when I received it.