That's income, not disposable income. It's also median, instead of mean. It's also wrong. Median income in the UK is £39,039 which is about $49,500.. You linked to the US Wikipedia page twice.

OECD is the source for disposable income.

US: https://oecd-better-life-index.truth-and-beauty.net/countrie...

UK: https://oecd-better-life-index.truth-and-beauty.net/countrie...