It is easy to accidentally put the wrong year on something, especially as a new year begins.
Peform a search on which Ancestry.com's World War I draft card database and you will find 10,907 entries born in 1918. Obviously there's a mistake somewhere (if you do not realize why WWI draft registrants cannot be born in 1918, review your American history before doing any more research). For all the ones I checked, the error was on the card as the one in this illustration shows.
So when searching, consider the fact that the original could be wrong and remember that indexers are supposed to copy the original as it was written--not as it is supposed to be.
