If you have better data, I'm sure the world would love to have it. The world, however, seems to agree the number is somewhere around 15-20%.

World Health Organization: 16%

https://www.who.int/news-room/fact-sheets/detail/disability-...

UN Department of Economic and Social Affairs: 15%

https://www.un.org/development/desa/disabilities/resources/f...

CDC: 25% of Americans

https://www.cdc.gov/disability-and-health/articles-documents...

ROD Group: 22%

https://www.rod-group.com/wp-content/uploads/2024/09/The-Glo...

Easily wayyy more than that given both the loosening standards of what a disability is combined with over-diagnosis. But I get your sentiment. When I was a kid, disabled meant you were in a wheelchair or needed someone to physically feed you, and now it means you have an Adderall prescription.

Well... in the UK it's now around 25%:

https://commonslibrary.parliament.uk/research-briefings/cbp-...

However, big caveat - it's self-reported. If you look at how many people get disability benefit it's around 10%.

So whether or not that is true depends entirely on what you mean by "disability" which is obviously not a well defined term.