If in doubt about how old it is I would change it. Sticking your finger in the fill hole will tell you if it's full, but it's kind of hard to tell the condition by looking at your finger. I believe the manual says to change it every 60K.
. . . . picking the lines with my twenty-nines . . . .
'99 sport 4.0 5 speed, top-of-the-line floormats