10 years 0 months 0 days = 9 years 11 months X days
subtract 2 months 24 days
9 years 9 months X-24 days
If the month has 28 days: 9 years 9 months 4 days
If the month has 29 days: 9 years 9 months 5 days
If the month has 30 days: 9 years 9 months 6 days
If the month has 31 days: 9 yeard 9 months 7 days