There is no age requirement. Anyone with a new item or innovation can share that item or innovation. This is what makes one an inventor, not age or any other subjective criteria.
You can be an inventor at any age.
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70
Lonnie Johnson the inventor was born on October 6, 1949.
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14
An old Polishman by the name of Nickoli Chekovzski
60years old.
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The Telescope Inventor, Hans Lippershey, was believed to have been in his 40s when he made the telescope around 1608.
Betty James, the wife of the inventor of the slinky, Richard James, passed away in 2008 at the age of 90.
George Sith inventor of lollipop, was born in 1592 to 1673, and died of poising by hie wife, Sharon Mccline.