As we were walking–yes, walking–by last Saturday, 1 Prospect Park SW struck us as the kind of building that must be full of old-timers with a long collective memory of what Park Slope (or Windsor Terrace, take your pick) was like back in the ’60s and ’70s. From Property Shark, we see that the 77,000-square-foot building was built in 1921. It doesn’t look that old to us but maybe we’re being unduly influenced by the aluminum windows and newer-looking balconies. So are we right in guessing that the demographic of this place skews to the senior citizen crowd? GMAP P*Shark