Birthdays were never made. You obviously come onto this earth at a certain date, thus your birth date...or in otherwords, birthday!
If you mean why do we celebrate it, it is because us humans like to celebrate the past year they've spent with their family and friends and how another year is over. Sort of like New Year.
No they did not have birthdays as there was no calender invented then.
My father always made sure he remembered his nieces' birthdays.
There is no specific collective noun for birthdays, however a noun suitable for the situation can be used; for example a cluster of birthdays, a series of birthdays, or a respectable century of birthdays.
Birthdays = Geburtstage
Yes. If they were born, then they have birthdays.
asian rituals of birthdays?
There is no patron saint of birthdays.
In Bulgaria in place of Birthdays we celebrate.. birthdays. We also have the so called nameday (saint day), but both birthdays and namedays are celebrated.
IF there where no birthdays or months no one will be born
Birthdays of Freedom was created in 1957.
Children on Their Birthdays was created in 2002.
There is no silver birthdays. There are silver anniversaries, but not birthdays.