Grandkids are kind of sneaky like that. I've been surprised a couple of times.
Stepson is 31 (single), Stepdaughter is 26 (single, but looks like she found a keeper), my oldest is 24 (and getting married in June) and the total grandkid count is 0 (zero)......... Youngest daughter is 18 and starting college this fall. Youngest is the only one who has said that she WANTS kids....