https://www.urban.org/policy-centers/cross-center-initiative...
I have to assume at least a few of those folks will be New Yorkers!
For what it's worth, though ... I'm not sure Google buying a building it already leases means anything other than perhaps they are bullish NYC real estate?
Pluses of living in New York include not needing to drive, most things being close by, and generally more widespread things like elevators. Old people can become less able to drive cars over time, or climb the stairs in a suburban home, or carry an SUV's worth of groceries.
They can walk to do their errands and meet friends.
They have an abundance of access to world-class medical care and specialists.
They have plenty of options for culture and entertainment.
There's no need to worry about shoveling a driveway or house/yard maintenance.