The present study assessed differences in the performance time of three age groups across the two original (Forms A and B) and three experimental (Forms X, Y, and Z) forms of the Trail Making Test. Subjects were 150 healthy individuals with no history of psychiatric or neurological problems. The age groups were as follows: Group 1 consisted of individuals between the ages of 20 and 39 years (M = 29.22; SD = 5.40); Group 2 consisted of individuals between the ages of 40 and 59 years (M = 48.56; SD = 5.50); and Group 3 consisted of individuals 60 years of age and older (M = 71.78; SD = 8.07). Separate one-way ANOVAS were performed for each Trail Making Test form by subject group. All ANOVAS were significant (p ≤ .05) even when Bonferoni corrections for multiple comparisons were applied. Post hoc Scheffe comparisons revealed that Group 3 differed significantly from Group 1 and Group 2 across all forms of the Trail Making Test. Group 1 and Group 2 did not differ significantly on any of the Trail Making Test forms. A separate ANOVA (group by gender) failed to reveal a significant effect for gender. These results are consistent with the previous literature indicating that, as people age, their ability to perform timed tasks decreases. The results also suggest that care should be exercised in interpreting the Expanded Trail Making Test scores of individuals over the age of 60.