20.
20 years old in July 2010. (2010 minus 1990 = 20)
Calculated from 2010, the year of birth was 1980. (2010 minus 30 = 1980).
2010 minus 1939 is 71.
2010 minus 1994 = 16
2010 minus 1981 is 29.
2011 - 1990 = 21
2010 minus 1895 equals 115(2010-1895=115)
2010 minus 1993 equals 17.
-7990 (minus 7990)
2010 - 1996 = 14
2010 - 1946 = 64
2010 - 1963 = 47