And after that public service announcement...
We don't know Lois's birthday -- I think we heard her astrological sign in one of the eps, but I can't remember what it was. Clark's birthday was shown as May 17th (in Tempus Fugitive). In the comics, he'd always had a leap year (Feb 29) birthday, but that's one of just many things that the show "adjusted" for their version.
But if you have the time to search, Zoom's site will have answers for every question you've got, plus lots of questions you hadn't thought of. She's a one-woman encyclopedia.
PJ
who hopes this makes sense since the cold medicine is kicking in...