An interesting way to look at whether neighborhoods are turning over or not is to see how many people recently moved in as home owners compared to how many have lived there for decades.
Below are two charts which show the percent of homeowners that moved into their home within the last 5 years versus those that have lived in their homes for more than 20 years. It would appear that fewer people are moving as often as they have in the past, and a greater percentage of people have remained in their homes for longer than 20 years.