It is to celebrate the day of your birth. and the reason why peoples 18th birthday is so important is because they are growing into an adult.
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People have birthdays to celebrate the day they were born. Universally birthdays are celebrated with parties.
Prob(two sets of matched birthdays) = 1 - [Prob(No matched birthdays)] + [Prob(One set of matched birthdays)] = 0.63
One! Why do people write such silly questions?
No. You're only born 1 day, and can only have 1 birthday. Of course you can celebrate it on another day, and then call it 2 birthdays, but you can only have one real :)
Because there is billions of people, and only 365 days for their birthdays to be spread over.
about 1,000