I prefer a simple "bicycle" announcement (instead of a "on your left" or a greeting). I keep telling myself I need a bell.

I sort of enjoy the occasional racer. Generally I just watch and don't actively participate in their imaginary race.

Although... to honest when I've noticed they are young enough to be a grandchild. And feel confidence they realize I am old enough to be their grand father. I have taken the time and [made the] effort to let them know.. old age... has hope.

We were all new and/or young once.