 In August 1946, Alvensleben married Astrid von Brand (widowed von Brockdorff-Ahlefeldt) and in 1952 he became an administrator of the von Brockdorff estate Ascheberg near Plön.In 1956, Alvensleben was involved with "Diakonisches Werk", a charity organisation of the Lutheran Church at Rendsburg.He retired in 1974 and died on 14 August 1982, in Ascheberg.