How do they actually know how someone voted? I never understood that. When the votes are tallied do they have a tag on them that says oh this one was and 18 year old and this one was a 90 years old. I don't get it.
"Young voters turned out to vote in higher numbers and favored Democrats by a wide margin, according to exit polls, providing a major boost to Democratic candidates in yesterday’s House and Senate elections."
They literally stand outside the polling places, and ask the voters how did they just vote and for what reasons, what's their age, etc.