Zijlstra retired from active politics at 63 and became active in the private and public sectors as a corporate and non-profit director and served on several state commissions and councils on behalf of the government, and continued to be active in advocating for a balanced governmental budget. Zijlstra was known for his abilities as skillful manager and effective Debater. Zijlstra was granted the honorary title of Minister of State on 30 April 1983 and continued to comment on political affairs as a statesman until his death from dementia-related illness at the age of 83. He holds the distinction as the shortest-serving Prime Minister after World War II and his premiership is therefore is usually omitted both by scholars and the public in rankings but his legacy as a Minister in the 1950s and 60s and later as President of the Central Bank continue to this-day.