It is 522 weeks.
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Depending on the number of leap years that fall into the 10-year cycle (2 or 3), there are 521.74 or 521.86 weeks.
There are 52 weeks in a year. A child who is exactly 10 years old has lived for 10 x 52 weeks, which equals 520 weeks.
260 (approximately) There are 52 weeks (approximately) in a year A fortnight is two weeks 52 / 2 x 10 = 260
there are 211 weeks in 4 years and 3 weeks
681 weeks is 13.1 years.