see 1.401(a)(4)-12 definitions
very briefly: testing age - testing age means the age determined for the employees under the following rules: (1)...normal retirement age is plan has uniform retirement age (2) if plan has different retirement ages for different groups use latest retirement age of anyone (3)if no uniform retirement age use age 65 (4) if an employee is beyond the testing age otherwise determined in (1) through (3) the testing age is the employees current age
65/5 is considered uniform. if perchance the person in question only has 3 years of participation, maybe that is what the software is using, if that is how retirement is coded.