Unlucky.
Septuplets
Quintuplets.
Eventsakes
They share a birthday, but not a birth date.
Nope - they would be 'step sisters' even if they were born at the same time. Twins would have to be born to the same mother.
I would call it a symmetrical date.
To absolutely guarantee that at least two people were born on the same date you would need 367 people. However with 29 people the odds would be approaching unity but it does not guarantee this will be the case.
A generation is a group of people born at roughly the same time. A contemporary is someone living in the same time period.
born on different years?
If you are just friends then no, it's not an actual date. If you have feelings for her and you think she feels the same about you, then you could call it your first date.
The same place you would go if you did have a date. There are no shops for people who do not have a date !!!
You call people gay if they are attracted to members of the same gender. But it's really better to call people by their names.