Throw on your bell bottoms, grab some Dunkaroos and your Tamagotchi, and rollerblade over to the movie theater to catch “The Little Mermaid” or another new retro film — this is shaping up to be the summer of nostalgia.

Why it matters: From the upcoming “Barbie” movie to a purple McDonald’s milkshake honoring the 52nd birthday of Grimace, throwback products and entertainment are huge this year — stirring up memories as they fill corporate cash registers.

Driving the news: The Gen Zers and millennials whom marketers call “kidults” seemingly can’t get enough of foods, fashions and movie franchises that remind them of childhood, and profit-minded companies are eager to please them.