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Consider the following confounding variables:

Having children might reduce the number of people you spend time with.

I have a few other ideas (finding a spouse also cuts down on the amount of time you spend out looking for one), but that's the big idea.

I wish they would run the numbers adjusting for parenthood.

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I think another valuable point to consider that may actually may understate popularity of those younger than 25 is that this is only looking at phone calls. I'm not under 25 anymore, but I think they generally use their phones for texting and messaging more than calls.

> Having children might reduce the number of people you spend time with.

That is something that they bring up in the actual paper.

http://rsos.royalsocietypublishing.org/content/royopensci/3/...

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