Age by decade refers to a way of describing individuals based on their age group. For instance, a person in their seventies is called a septuagenarian. The prefixes for these terms are derived from Latin, such as "septuageni," meaning seventy.- Denarian: A person aged 10 to 19.- Vicenarian: Someone in their twenties.- Tricenarian: An individual in their thirties.- Quadragenarian: A person in their forties.- Quinquagenarian: Someone in their fifties.- Sexagenarian: A person in their sixties.- Septuagenarian: Someone in their seventies.- Octogenarian: A person in their eighties.- Nonagenarian: Someone in their nineties.- Centenarian: An individual aged 100 or more.- Supercentenarian: A person who is 110 years or older, with no upper age limit.The terms denarian, vicenarian, tricenarian, and quadragenarian are not commonly used. The term supercentenarian was first introduced in 1991.
