If two children are conceived on the same day but one is born prematurely, both children are technically the same age.
If two children are conceived on the same day but one is born prematurely, both children are technically the same age.
Because of the date of conception and all that.
No they are not. Birthdays are calculated from the day of birth, hence birthdays. And zygotes are not yet people, no matter what the forced-birthers tell you.