It turns out that, somewhat to my surprise, I am not (yet) the Last One Standing from the relatively small Menlo Park office where I was hired as a data-entry temp back in 1994. There is at least one other employee left in the company who worked in that office with me, and she actually hit her 20-year anniversary before I did even though I showed up first because of the 14 months of contract work that doesn't count toward total time served.
There was nothing special at the Day Jobbe today nor any recognition of my anniversary. (The payroll system's time-off accrual has recognized that I've jumped to the next five-year plateau and will start earning Paid Time Off at a higher rate.) As is my usual pattern, I left around 11 (having already logged about 48 hours this week by COB yesterday) and headed home to Fernley. I had a number of errands to do along the way, including visiting my sister and the care facility where they continue to work on trying to rehab her breathing sufficient to let her go home, before heading over the mountains in lovely clear weather. I'm very happy to be home.