In my 30 year-old neighborhood in Silly Valley, most of the remaining original owners are in their late 50's to early 70's. Walking around some mornings, it looks like the gated retirement community a few miles away. The houses are selling in the 7 figures now, but many of the remaining original owners and others in that age category are planning on aging in place and modifying their houses to do that.
Some folks own rentals, often the home they moved from when they moved here. The rents for those properties are $3-4,000, based on the ones of which I am aware. Two social security checks, the net rental income, and even a moderately sized 401k portfolio is easily going to put these folks into the six figure income bracket. With paid off houses and low Prop 13 taxes, there is no financial incentive to move.
Everyone, especially real estate agents, talks about the coming baby boomer real estate liquidation sale. Ain't gonna happen, at least not here.