Both natives of Norwalk, Lonz married the former Margaret Clark on Sept. 10, 1966, at St. Paul Catholic Church, Norwalk.
They are the parents of Julianne Flaherty, of Pinckney, Mich.; Mary Ellen Kaye, of Avon Lake; Brian, of Norwalk; and Gregory, of Bluffton, S.C. They have 15 grandchildren.
James has 44 years of service as a veterinarian with Mapleview Animal Hospital, Norwalk. Margaret is a retired nurse.
They attribute their long marriage to their faith, and they have both enjoyed time with their family and cycling trips. They enjoy traveling and golf.
A family gathering to celebrate is planned for Saturday.