This study does not include the 63 year old Michelle Yeoh in Wicked: For Good, which made $56 million in British box offices in 2025 according to the source the study claims to be using. Compare this to the $6 million made in the UK by Alleluyah, which the study does include.

Trying to find more information about their methodology on their website:

The dataset comprises the top 100 films released in the UK in 2023, 2024, and 2025, based on British Box Office gross figures sourced from Box Office Mojo. Rankings were determined using in-year release totals, with re-released films excluded. Actor age was standardised as age at the time of each film’s release.

Lead cast members were identified using information scraped from the IMDb Full Cast & Crew page for each film. This was achieved using the AI tool Gemini and manually checked and updated by an internal team at Ageing Better. IMDb typically lists cast in an order that reflects the most complete on-screen credits, usually corresponding to end credits. However, this ordering may differ from poster billing, opening titles, or promotional materials, as some films present cast alphabetically, by order of appearance, or according to negotiated billing arrangements.

lol

I think the study simply fucked up. I found Yeoh in under five minutes of just checking the UK top 10, who knows how many other actresses Gemini overlooked that the "manual check" didn't catch either.