Justin was born on the 31 January 1981. On the 7 February 2013 he was 32 Years old
or 384 months old
or 1,670 weeks old
or 11,695 days old

Mila was born on the 14 August 1983. On the 7 February 2013 she was 29 Years old
or 353 months old
or 1,538 weeks old
or 10,770 days old

Their age difference is 3 years, or 132 weeks, or 925 days. You could also say that he is 8.59% older than her or that she is 7.90% younger than him on this day.