If he was a friend of Athena's since childhood and hung around a certain park in town often, he probably ran into the Clubs Quartet (Edgar, Argine, Andrew & Rachel) a few times. Rachel especially made it a point to hang out in town as often as possible. She's 38, so bit of an age gap, but still maybe?

They'd likely have stopped hanging out if they did hang out somewhere around when she was 16-18ish and he was 11-13ish so idk.

*complete incoherence trololo*