The processes that condition beer move exponentially slower at lower temps, and the freezing point of a 5.0% alcohol solution is 28F.
Your 6.9-7.5% ABV beer would be just fine for somewhere in the neighborhood of 8-12 months at room temp.
Get it down to cellering temps in the mid 50s or even better down to fridge temps, and it'll be absolutely fine for more like 18-24 months.
Primary #1 - Midnight Ryeder (Midnight Wheat and Rye)
Primary #2 - Florida Weiss
Primary #3 - EMPTY!
Secondary #1 - Downtown Flanders Brown (brewed August 2012)
Keg #1 - Pina Colada Florida Weiss (smoked Pineapple and Coconut Berliner)
Keg #2 - Cinnamon Raisin Cider
Keg #3 - NONE!
Bottled - NONE!