Aged 90. http://news.bbc.co.uk/1/hi/world/americas/8512198.stm
Here's the strange bit:
Why would children name a flying rotating disc after a pie?In 1957 Mr Morrison sold the rights to the California firm Wham-O, which discovered that youngsters were calling the toy a "Frisbie" after the name of a well-known pie. The company changed the spelling to avoid trademark infringement and the Frisbee was born.