Some juices do not age well. I keep them in the fridge.

well the only juices that get a chance to age are the crap ones I don't vape, still have some premixed partials I haven't pif yet. lol.
Now this is just from what I've researched. There doesn't seem to be a definitive view on whether you should store in a coll dark place, fridge, or freezer. BUT, for flavoured juice, the fridge or freezer is not recommended. There was a thread on ECF where they some users found flavoured juice "unvapeable" after storing in the fridge or freezer for an extended period. For unflavoured, it seems to be OK..
Think the main reason for storing in dark places, is that sunlight can promote oxidation of juice and darken it. I keep my main stash in 250-500 ml bottles, basically the empty VG, PG, and Nic Base bottles of product used. I then pour each flavor into a 50 ml bottle, which I keep in my vapestation for daily tank top offs, and for dripping.
The smallest batch I make now is 100 ml, and my House Specialty Juices, I'll mix at 200-400 ml batches. That way I can go a couple months between mixing. When ever I get a new rba, I try to develop a new recipe just for it. So far have 5-6 ADV's and a few flavors of the month also. I keep everything but mixing supplies and backup at room temp, but in the dark. lol. Works for me.