help with model numbers

Looking for the approximate ages of a comfortmaker furnace CNJ100N16N1 and an Goodman A/C 9904490231
the #'s were hard to read but i think i got them right.

thanks

The goodman is april of 1999

**Comfortmaker (International Comfort)**Uses the first letter for the month (skipping I) and the first two digits are the year.

Gary