63 Days Gestation for a Cat - The domestic cat has a nine week pregnancy. :o)
10 Christmas cards in a set of cards
I reckon it's likely to be Turn of The Century
23 Pairs of Chromosomes (in a Human Body)
2 Ugly Sisters/Stepsisters in Cinderella
300 Length of Noah's Ark in Cubits
6 Correct numbers to win the lottery
31 Ice Cream Flavors at Baskin-Robbins
52 cards in a deck without the jokers
9 C of H in D I? 9 circles of hell in Dante's inferno.
C = (F - 32) x 5/9 = (63 - 32) x 5/9
ten commandments
32 Counties in Ireland