The Rules:
any previous found cache can count.
all types of caches qualify.
if the cache has since been archived, it DOES still count.
these must be caches listed on geocaching.com that you have personally(physically) found and logged.
finds without the proper verification/documentation will be deleted.
if you are unable to find a qualifying cache placed on your geobirthday, then a cache placed within +/- 1 day of your geobirthday can be used..
to claim a find on this cache, simple include the gc code and name of your qualifying cache..
have fun!!