To 'be very honest, I do not like when my age ends in an odd number. When I am on an odd number for my age, I tend to forget my age and go one-year up making me a year older than I am.
If you look at age in months, then one has more prime timepoints to collect info. Also, Vanessa Blaszyk would only need to round up 1 month instead of a whole year. If the study were on zebrafish, prime number weeks could be a better choice🐟.