How can you tell if someone is checking you out?

I’m aware I’m a little old to not know, but I have never really had someone who I felt comfortable asking this kind of stuff. My mom doesn’t know much about dating in the US since she’s from Japan and I feel weird asking my sister or brother. My friends sometimes are just as clueless as me when it comes to this stuff (not always though).

How can you tell if someone is checking you out?
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