One of those "hand-washing reduces infections" paradigm shifts - the role of viruses in accelerating aging is still not fully acknowledged.
I predict COVID-19 will, unfortunately, be a prime catalyst for this.
During their lives, centenarians rarely get sick. New paper with 1,400 subjects finds a history of infections (pneumonia, herpes, UTIs) associates with earlier frailty. The authors speculate that obesity makes people more susceptible & that viral infections may accelerate aging