A chorus girl kicks up her heels — an actor jumps around on furniture — no big surprise. In the theatre, these things happen.

But usually, the chorus girl and the table-hopper aren’t senior citizens. This fall, they will be.

A new bittersweet stage comedy, Best If Used By, will be performed by two North Shore actors in the range of 80 years old.

The biting and sometimes surprising humor of the story focuses on issues of aging and ageism — topics of growing concern to increasing numbers of Americans.