In many states like Texas older homeowners property taxes are locked in once they hit 65.
If they sell... they would have to not only pay taxes on the appreciation... but they would have to buy somewhere else at the going tax rate and valuation.
Thus, they are just choosing to stay forever.
The best thing for a senior to do is buy the biggest mansion they can afford just prior to turning 65. Then let their family move in with them and have everyone share in the advantage.
If that were true we would have stayed in Texas!
Colorado seniors get a discount on property taxes, but only if they've lived in the same house for at least ten years. If they move, they won't qualify again for another ten years.