Brief, clamorous laughter carries over the thin wall separating Ann-Marie Selfridge’s office from the main activity room. The outbursts are accompanied by the sounds of a “Best of 70s, 80s, and 90s” YouTube playlist, which scores the afternoon. Selfridge, executive director of Adults Communicating Together (ACT), a senior adult day care center in Staten Island, is not bothered by the noise. For her, laughter and noise are welcome reminders that her seniors survived Covid.