Eighteen is a composite number, its proper divisors being 1, 2, 3, 6 and 9.
18 is the age limit for being allowed a driver's license in many parts of the world.
... present, and 30.7% are non-families. 22.6% of all households are made up of individuals and 8.2% have someone living alone who is 65 years of age or older. Th ...