You had no age at all on January 28, 1984. After that, you began
to pick it up at
the rate of 1 year per year. You turned 1 on January 28, 1985, 2
on January 28, 1986,
3 on January 28, 1987, and so on.
You turned 28 on January 28, 2012, and if all goes well for you,
you'll turn 29 on
January 28, 2013. Good luck !