Charlie Chaplin was 36 years older than his 4th wife, Oona. When they married, he was 54 and she was 18.
According to History.com:
After her husband’s death in 1977, at the age of 88, Oona O’Neill Chaplin became famously reclusive. She reportedly never recovered from her grief, and died from pancreatic cancer in 1991, at the age of 66.