Me too!  And I wonder if they’re moving in that direction.  I noticed this on the SW website the other day:
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I never noticed anything that broke down ages of children before.  Maybe it was there & I missed it, but I think it’s new.  It’s only on the website, the app just listed adults & lap children.  But I’m wondering if this is part of the plan to designate specific family boarding tickets.  And a way for SW to know exactly how many people to expect in family boarding, maybe so they’ll know how many rows are needed?   Interesting anyway.