I worked as a claims rep for Social Security back in the early 70s.
Baptismal Records were one of the common tools we used to establish age. I was also surprised at just how good Mississippi Black School records were for just after 1900.
Just looked at some of the 1887 baptismal records for Zapopan. Very longwinded entries and the handwriting is not that easy to read so I am not inclined to search through them (when it is not likely this lady was actually born in 1887). I’ve looked at other 19th-century Catholic church records on FamilySearch (in a European country) which were more clearly presented and much easier to search through.