1 year = 12 months
2 years = 24 months
3 years = 36 months
.
.
10 years = 120 months
.
.
20 years = 240 months
21 years = 252 months
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12 months/year x 21 years = 252 months
12 months = 1 year 21 months = 21/12 years = 1.75 years = 1year 9months
1.75 years
21 days and no hours
21