I've worked out the age-related purpose(s) of Christmas:

0 - 2 No idea
3 - 13 Excitement
14 - 18 Cynical present accumulation
19 - 23 Food
24 - 32 Parties
33 - 50 Nice for the little 'uns
50+ Food and sleep

Probably need to do it as a Venn diagram.

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