A simple answer is 1/12 = 0.0833... since there are 12 months in a year, of which 1 has been selected.
A slightly better estimate, allowing for the the fact that July has 31 days is 31/365 = 0.0849. Adjusting for leap years does not affect the probability at 4 decimal places.
These answers assume that births are uniformly distributed over the year. In fact they are not but comprehensive information on births by month is not readily available.
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1/12
like any other birthday
pretty easy tbh
12 months in a year, one person(aka me my birthday is in july)
is born in july, so thats 1/12
Before your birthday in July 2010, you're 67. On your birthday in July 2010, you turn 68.
If you were born in July 2005, and today is before your birthday in July, you would currently be 15 years old. If today is after your birthday in July, you would be 16 years old.
A person born in 1998 turns 18 years old on their birthday in 2016. Specifically, if they were born any time in 1998, they would celebrate their 18th birthday on that date in 2016. For example, if they were born on July 15, 1998, they would turn 18 on July 15, 2016.
You turn 37 on your birthday in July 2013.
my birthday was on July 14 1994