Do you ever wonder about people sometimes?

The ones you've touched slightly but never did they remain in your presence for a long time. I meant those you said “Hi” to when walking in the school hallways, those who went to your birthday parties when you were a kid but never again when you became a teenager, those strangers you met on the street and maybe had a random conversation with. I sometimes think about the people I used to know and talk to. I wonder how they’re doing.