An 18-year-old (Maisy Stella) takes some mushrooms with her friends only to find herself getting life advice from her wise-cracking 39-year-old self (Aubrey Plaza) in 'My Old Ass'.

This coming-of-age comedy has already premiered to rave reviews at Sundance Film Festival. Produced by Margot Robbie, and written and directed by Megan Park, the film sees 18-year-old Elliot Labrant embark on a life-changing summer before heading away to college.

Park said at the movie premiere at Sundance: "I kept thinking about this idea: there was a time when you did something like play pretend with your friends, and then you just never did it again. That made me really emotional. I also wanted to immerse myself in a joyful film and something that made people feel nostalgic for an easier, simpler time in life. Because life can be hard and shitty sometimes."

'My Old Ass' is set to arrive in Irish cinemas on September 27th.

Watch the trailer below: