@Nick_Searles I included only the last 10 or 15 years of work. Most of what came before that was irrelevant, and no one who's hiring likes slogging through a long resume anyway. Certificates and diplomas don't need dates.
Of course I was in telecomm, where having to remind myself that T1 lines just don't cut it anymore was definitely a liability. Other trades/professions may be different.