Yes, but I think everyone agrees that non-adults shouldn't be allowed to vote (being dependent on their parents), while if a country has too big of a chunk of i

Yes, but I think everyone agrees that non-adults shouldn't be allowed to vote (being dependent on their parents), while if a country has too big of a chunk of its adult population without the right to vote (think if Quatar was a democracy, because citizenship is so restricted there), it would not count as "universal suffrage" ? (On the opposite, you have countries where you can vote in local elections even if you do NOT have citizenship.)