Schedule B, Line 8c--Schedule of Active Participant Data. Summary: This is an example of the schedule required to be completed for Line 8c of Schedule B. It lists the Attained Age of the participants in the plan (from under 25 and in 5 year increments up to 70 & up), the Years Of Credited Service (under 1, 1 to 4, 5 to 9, and 40 & up) with additional year increments listed in the instructions for the formatting and completing of this attachment.