theres no formal term for it I think decade is the smallest (barring slang like nickel used to describe prison term)
A group of 5 is called a quintet.
Pentology
Octogenarians.
A group of five paintings together can be called a "series" or a "collection."
A herd.
You would call a group of performers something different based on what they are performing, and how many of them there are. For example, a group of performers in a certain type of play could be referred to as a troupe, and a group of 5 musicians in a quintet.
a group of seniors. ------------------------ Nothing: With your attitude, they won't come to you anyway!
india
You would call a group of performers something different based on what they are performing, and how many of them there are. For example, a group of performers in a certain type of play could be referred to as a troupe, and a group of 5 musicians in a quintet.
decate
What do you call a group of Dancers?
an idiotical freak