Jen;
Where I live, I am, surrounded by Neonicitinoid corn and beans on three sides. The other direction I have a small town with gardens and yards.
Between the neonics, the 24-D, Roundup, etc, etc being put on fields, and in town, the garden sprays, flower sprays, the folks spraying their yards to kill dandelions etc, etc.. I try to rotate out comb within 5 years.
It is ONLY my philosophy, that rotating out at LEAST a percentage of my comb each year limits the build up of those harmful things in the wax.
If not for this build up over time, I would probably not remove older comb until the queen stopped laying in it.
Where you live, you may not have fields of corn and beans on your doorstep, but you will still have gardens and yards etc. So it is "my" recommendation that you write the dates on the top of your frames for reference.
JUST, reference! Rotate out some of the oldest frames each spring, give your bees 5 to 10 new frames if you use mediums, and 4 to 6 new frames if you use deeps each year. Doing this, you will reduce the amount of harmful build up. You will never eliminate it all.. Marla Spivak and many others have come to the conclusion that the cocktail, or MIXTURE of all the chems people spray on their yards, along with the chems they use to kill mites, is combining in the wax to create a lethal situation.
I have never found a hive DEAD because I didnt get to rotate out ALL of the 5 year old comb. It isnt an EMERGENCY situation.. rotate more out later, or next spring, but make the attempt to replace a little of it each year, and you will have a happier healthier hive. The bonus here is that you also help inhibit swarming by providing the bees with employment!
My own personal philosophy based on what I have read and experienced.