Keston wrote, produced and performed a one-man show, "Expressions of Aging." This two-act play with music reflects his love of history, acting, music, and the English language, on the theme of growing old. He performs selections from it to this day. The first act is straight acting—no music. Keston relates autobiographical episodes of his early days as an actor, when he would dash to the theatre by train with just enough time to make up. Then, in full view of the audience—and in almost no time—he puts on a dash of make-up, applies a wig and beard with spirit gum, and slips into a nightgown, to become the historian John Aubrey in his late life. Speaking in an English accent, Aubrey tells tales, complains about his ailments, and relates court gossip.