User talk:69.144.217.222

Manual of style for numbers
Please read MOS:NUMERAL which says that single-digit ages are expressed as words rather than numerals, unless there is also a double-digit age in the same sentence, in which case both should be the same, either numerals or words. Binksternet (talk) 18:21, 6 September 2018 (UTC)

Funny, I read that section of the MOS top-to-bottom, twice, and it does not adress ages whatsoever.

In any event, it is proper style to always express ages as digits. Period.