Conversation so far:
How old was George Burns when he died?
100
Did George Burns make any films during his final years?
Radioland Murders (1994) as Milt Lackey (last film appearance)
What did George Burns do in his final years?
He bought new Cadillacs every year and drove until the age of 93.
Did George Burns make any other appearances before the one in Melbourne, Australia?
What was George Burns' cause of death?
Cardiac arrest

Question: Was he sick for very long?
Self-contained rewrite: Was George Burns sick for very long?