This may be terribly elementary, but how accurate were people in the 19th/early 20th centuries about things like dates of birth etc? I have an ancestor whose d.o.b. varies from 1853 to 1855 depending on which source you're looking at..............clearly they can't all be correct. Maybe it didn't really matter how old people were once they were adult? I think the date of birth on his gravestone is wrong but it was probably put up by in-laws who might have known when his birthday was and roughly his age but not the exact year. any thoughts?