mesolithic age(n = noun.time) epipaleolithic, mesolithic - middle part of the Stone Age beginning about 15,000 years ago;
is a kind of period, period of time, time period
is a part of stone age

age, age bracket, age class, age group, age limit, age norm, age of consent, age of fishes, age of mammals, age of man, age of reason, age of reptiles, age old, bone age, bronze age, chronological age, come of age, developmental age, drinking age, elizabethan age, eolithic age, fertilization age, fetal age, gestational age, golden age, ice age, information age, iron age, legal age, mental age, mesolithic, middle age, neolithic age, new stone age, of age, old age, paleolithic age, silver age, space age, stone age, stone age man, tender age, victorian age, voting age