Listed here are the major milestones or personal events that occurred during the life of Harold Koster and other closely related family members. This includes the dates of birth, marriage and death along with the places of residence over the years. Events are noted for this person and his or her spouse and children.

0 7 Sep 1917 Dundee Township, Monroe County, Michigan. He was the second of three children of Lena (Heiden) and John Koster, Jr.
4 1921 Violet E. Keck was born
19 1936 Dundee High School, Dundee, Monroe County, Michigan.
20 23 Jan 1938 Harold married Violet E. Keck in Raisinville Township, Monroe County, Michigan.
45 1 July 1962 John Koster, Jr died at the age of 82 in Toledo, Ohio
56 14 Mar 1973 Violet E. Keck died at the age of 52 in Lucas County, Ohio
56 18 June 1973 Lena Koster died at the age of 91 at the home of Marvin Koster in Raisinville Township, Monroe County, Michigan.
66 14 June 1984 Lake Park Nursing Home in Sylvania, Ohio
17 June 1984 Maple Grove Cemetery, Dundee, Monroe County, Michigan.