1965 vintage predominant
Burien sits older than that median: the typical house here went up around 1965. That's a real gap, not a rounding difference. A door installed for a 1965 build has usually been replaced at least once by now, sometimes twice, and what's on the house today is often a patchwork - original tracks with a newer opener bolted on, or a replacement panel that doesn't quite match the spring size the rest of the door wants.
