Mrs.Somerville finished her "Molecular and Microscopic Science" at eighty-nine.
Humboldt completed his "Cosmos" at ninety, a month before his death.
Burke was thirty-five before he obtained a seat in Parliament, yet he made the world feel his character.

Unknown at forty, Grant was one of the most famous generals in history at forty-two.

Eli Whitney was twenty-three when he decided to prepare for college, and thirty when he graduated from Yale; yet his cotton-gin opened a great industrial future for the Southern States.

What a power was Bismarck at eighty! Lord Palmerston was an "Old Boy" to the last.

He became Prime Minister of England the second time at seventy-five, and died Prime Minister at eighty-one.