Christopher Eckhardt was 16 years old when he took the actions I'm referring to. (Just for the record, the actions in question occurred in December of 1965). Mr. Eckhardt died at age 62 on December 27th, 2012.
The section here on usage of the word late (referring to death, not punctuality) suggests that it is appropriate for this context, but I can't figure out a way to use it in conjunction with his age at the time.
I know that the construction/sentence/mess that I have now is clearly wrong, but I have not the slightest clue how to fix it.
On that note, the monstrosity reads as follows:
"In December 1965, a group of students, meeting in the home of the late, then 16-year-old Christopher Eckhardt, of Des Moines, Iowa, made a plan to publicly display their support for a truce in the Vietnam war by wearing black armbands throughout the holiday season."