Contra Events Pairing Callers By Age?

A friend observed a pattern where contra dance events seem to be pairing older and younger callers. I looked over my notes for two-caller events in 2025 and saw [1]: Two older callers: 33 events One of each: 30 events Two younger callers: 4 events Seems pretty clear evidence of pairing, no? But this actually turns out to be what you'd expect to see if organizers ignored age. With 67 two-caller events there are 134 slots. Of these, 96 (72%) went to older callers and 38 (28%) went to younger ones. So there are four possibilities: caller 1 older caller 1 younger caller 2 older 72% * 72% 28% * 72% caller 2 younger 72% * 28% 28% * 28% This gives us: Two older callers: 34 events (72% * 72%), vs 33 observed One of each: 27 events (72% * 28% + 28% * 72%), vs 30 observed Two younger callers: 5 events (28% * 28%), vs 4 observed While this is very slightly in the direction you'd expect if organizers preferred to match different-age callers, it's well within what you could get by chance. It looks…