Ian Campbell’s review published on Letterboxd:
I think there's an immediate charm and cleverness to how simple and on the nose a lot of the premise of Old is. It's dumb, but should be super effective, right?
Sometimes it is, but the eagerness with which the "clever" explanation is also doled out really gets in the way. There's interesting visual ideas, super clunky dialogue, and brief glimpses of better performances from most everyone in the cast -- delivered in a far too awkward package without a real punch or sense of surprise. Not a lot of thrill from a thriller director.
I'd be into a Shyamalan Twilight Zone, with this as an episode, but its not really working for me as a feature length film.
I worry for Vicky Krieps' Hollywood career.