It might have been patriarch Jay Young who used to say [paraphrased of course] “If you suspect that a bottle might contain dangerous levels of peroxides, had you not better treat it as if they were/are indeed present?”  I have seen it mentioned that one of the more likely places for peroxides to form could be in the threads of the cap, I.e. removal of the cap for testing could trigger a detonation.   So I think it would be prudent to try to identify any known or suspected old containers early on, and get rid of them.  

After that, by all means ride herd on your current dated inventory via regular checks.

There are time thresholds for testing too.  Once a year might not be adequate for some compounds.  Purity can make a difference too, e.g. some ultrapures would not contain inhibitors commonly present in lower grades of the same stuff.

Good luck.

sjs