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If you date it from the Missouri Compromise (1820), the answer is forty-one years.
Literacy rates have dramatically increased in the last 100 years. Nearly all individuals are literate by the time they are in first grade.
When Abraham Lincoln was 10 years old, he was kicked by a horse, collapsed and nearly died.
The Democrat Party has had the majority in Congress for the longest duration over the last 40 years. Out of the last 22 Congresses they have had the majority 12 times in the Senate and 14 times in the House.
The American Indian wars lasted off and on over the course of nearly 300 years, approximately 1622 - 1924.
Tolkien taught for nearly forty years (1920-1959).
The duration of Forty Years is 1.42 hours.
A period of forty years is called a quadragennial.
Forty Years On - song - was created in 1872.
Forty Years was created on 1938-08-28.
Forty Years' War happened in 1385.
Forty years (plus the year of the Ten Plagues, plus a couple of years in his infancy).
Forty Years Among the Indians was created in 1890.
The Rolling Stones wrote and recorded that song, nearly FORTY YEARS before Britney's cover version.
"Forty" is an adjective modifying "years," which is a plural noun.
Forty Years Among the Indians has 400 pages.
In French, "forty years" would be said as "quarante ans."