At first, her summer is defined by intense romance with another young woman, but then — one night guzzling mushroom tea — she meets her future 39-year-old self. This is a wiser, world-weary Elliott — and a softer than usual Plaza,

Megan Park’s “My Old Ass” is premised on a familiar conversation starter: if you could tell your younger self anything, what would it be? Writer/director Park dreams up a supernatural scenario in which this actually comes true for protagonist Elliott, played at age 18 by Maisy Stella (in her film debut) and at age 39 by Aubrey Plaza.

Director Megan Park’s second feature, starring Aubrey Plaza and Maisy Stella, takes an inventive approach to asking questions about fate and forgiving oneself.

Maisy Stella plays a teenage girl on a mushroom trip who meets her 39-year-old self (Aubrey Plaza) in the coming-of-age movie "My Old Ass."

MARNI GROSSMAN © AMAZON CONTENT SERVICES LLC In Megan Park’s new coming-of-age film, My Old A**, 18-year-old Elliot comes face-to-face with her 39-year-old self. The fantastical, chance meeting comes after the teenager trips on mushrooms.