I did a pretty huge study on polyamory I'm still processing the data on (so it's not published), but iirc the age gap wasn't that significant? I'll have to doublecheck.
Ok I just checked again - weirdly, the more poly someone was the more likely they were to be older. This was a pretty slight effect (r=0.16), but significant based on the sample size (~3,500)
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So when I originally collected this data I remember finding no significant difference in relationship length correlated with polyness. Checking again, I'm finding a strong positive correlation between poly-identification and relationship length. I'm confused by this