I work on the road, and had some e-juice that was about a year old sitting in my house when I was gone. My air conditioner had quit on me the morning I left, and the house sat through one of the hottest summers on record in Oklahoma completely closed off, with 30+ days straight over 100 degrees and zero air inside. I was gone for about 3 months, had the A/C fixed 2 days before I got home, and I am vaping that juice. Some of it turned pretty dark and I threw it out, but any juice that was not dis-colored is being consumed. Seems fine to me.
I'd say it stores pretty well.