This just happened today -

I decided to work late today (you know, just for kicks ... I was curious to see what it was like ;P ). I ended up taking the 6:03pm train home. I sit down on an aisle, and then some well dressed man in his 50s sits down diagonally from me at the window. Then two friends show up (one in his 40s and the other in his 30s) and take the remaining two seats.