How do we known that we love someone​

You will feel it friend

Explanation:

you just know

Explanation:

you get the fluttery feeling in your chest, and you feel alive when you're with them, you start caring about the way you look around them, someone else might point it out to you, or you might recognize it, there's not really one way to describe it, it's different for everyone, but you'll know

the longest time is 123 years