Shoot, jogger. Sometimes it's easy to forget that old people don't know how to use the internet. I'm sure
@Revolver didn't mean any harm.
Just have your kids help you navigate to
www.dictionary.com and type in "coevals" in the top bar. If you then click on that little magnifying glass thing it will search (get it?!) for the word and give you the definition. I've done this one for you to save you the trouble but you really should practice this on your own
coeval
adjective
of the same age, date, or duration; equally old: Analysis has proved that this manuscript is coeval with that one.