First of all, let's define a democratic country in the context of this answer. I'm going to answer under the definition that any country that regards itself as democracy is one; you will see why this ultra-inclusive definition becomes irrelevant later. Universal Suffrage is a relatively new idea. read more
The first political entity to grant universal suffrage to all its population was the the territory of New Zealand, in 1893. It was under British rule at the time, so it doesn’t truly count as a “country”. read more
As an autonomous Grand Principality in the Russian Empire, Finland achieved universal suffrage in 1906, becoming the second country in the world to adopt universal suffrage. The Finnish parliamentary election of 1907 was the first time when women were elected (19 of 200 MPs). read more
Britain does not have a claim to being the world's oldest democracy, as it has only existed since, at the earliest, 1707. Cameron King-Black, Glasgow, Scotland NZ wasn't the first to have universal suffrage. read more