General fact: 25 is the minimum age of candidates for election to the United States House of Representatives.
Mathematical fact: 25 is the formula in this list can be described as 10n * Z + (2Z + 1) where n clearly depends on the number of digits in Z and in 2Z+1.
Trivia: 25 is the number of years of marriage marked in a silver wedding anniversary.
Historical date: January 25th is the day in 1915 that Alexander Graham Bell inaugurates U.S. transcontinental telephone service, speaking from New York to Thomas Watson in San Francisco.