Vacuum sealed and placed in a 8mil mylar heat sealed bags and kept in my well sealed ammo cans in the basement at 65F year round.
I wouldn't ever place raws in the freezer simply because the constant freeze thaw cycles are bound to put stress on the molecular bonds. I've read it causes sheer force with this constant threat of moisture combined with temp fluctuations.
It would seem to me raws kept dry, free of oxygen, free from UV light, kept at a lower average temp using higher melting point compounds such as base, ace, prop, phenylprop, cyp, you should be able to use them for many years.
The thing is if you are brewing, only brew enough to last 6 months at a time as we have seen thanks to jano that degradation happens quickly once brewed.