America, as currently patterned, is a fragile society. People balance work and family through ad-hoc systems with few redundancies. Now a pandemic comes around that killed a bunch of people who were providing informal support for the main workforce.
A man in Georgia can't do full-time anymore because he's a single dad and the daycare shut down for the duration of the pandemic. A mom exits the workforce because the grandparents who were watching the kids after school are now dead. Someone loses someone dear to them and re-thinks their life direction. These things add up.
But I had the impression people were unable to retire or retiring significantly later.
[0] https://www.statista.com/statistics/1191568/reported-deaths-...