1920 or 1921 (if birthday in January)
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There are 12 months in one year. Therefore, 90 months is equal to 90/12 = 7.5 years.
90/365 years or about a quarter of a year.
There are 7 1/2 years in 90 months. Remember that there are 12 months in one year. Therefore, we're left with 90 months ÷ 12 months/year = 7.5 years.
Adding 90 days to October 16 of any year gives January 14 of the following year. For example, 90 days on from October 16, 2010 is January 14, 2011.
going 90 miles per hour in an automobile made in the year 1965