I have a teenage granddaughter who swims at the Y with the high school swim team. I do not think it is safe to let teenage girls in the same locker room area as teenage boys and older men. Too much can go wrong. As a member of the Y I am not sure I would feel comfortable going into an area like this myself to get changed, especially if it is mostly empty. Anyone who doesn’t feel comfortable changing in an open locker room can either use the family changing area, wait to get changed when they get home, or change in a bathroom stall.