according to the posted website Australia is the oldest, not the USA.
Edit: Actually Switzerland seems to be older in their data
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I'm curious what the article's source is for this claim. Naturally, democracy can be defined differently, but there are reputable sources that disagree with this [1], and even if considering limited suffrage to preclude democracy, Australia and particularly Switzerland perform poorly as well.
https://www.weforum.org/agenda/2019/08/countries-are-the-wor...
They seem to take their definition from here:
"The identification of electoral democracies is based on the Regimes of the World classification by Lührmann et al. (2018).
In electoral democracies, citizens have the right to participate in meaningful, free and fair, and multi-party elections."
The article discusses it's sources, and also the inherent difficulty in defining "democracy".