The actors playing "Cindy" and "Harry" portray them at several ages throughout their life, from grade school to adult. You might like to choreograph simple on-stage costume changes to denote each age, though I don’t think it’s strictly necessary.
"Cindy" appears in the play at ages 8, 10, 15, 17, and 27, all played by one actor.
Can be played by:
Any adult age
"Harry" appears in the play at ages 11, 13, 18, and 30, all played by one actor.