If a person turns 15 in 2011, then they were born in 1996. In 2012, a 15-year-old would have been born in 1997. If they turn 15 in 2013, they were born in 1998. Which means then that turning 15 in 2014 means you were born in 1999.
It's quite simple.
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If you were born in 1995, you would need to subtract 1995 from the current year to find your age. For example, if the current year is 2022, you would be 2022 - 1995 = 27 years old.
To determine your age in 2009 if you were born in 1994, you subtract 1994 from 2009. This calculation results in 15, so you would be 15 years old in 2009.
About 15-16 years old mainly 15 though
The 10th grade - 15/16 years of age
1 year = 365 days = 52 weeks 1 day.(1) If year 1 or year 2 of the 15 year period was a leap year then there would be 4 leap years in the period.(2) If year 3 or year 4 was a leap year then there would be only 3 leap years in the period.Each leap year gives 1 extra day.Condition (1) 15 years = 15 x 52 weeks + 15 days + 4 days = 782 weeks + 5 days.Condition (2) 15 years = 782 weeks + 4 days.NOTE : Deduct 1 further day if the 15 year period spans a year number not divisible by 400 (for example 1900)