Old people are attached to place. They have social support networks and families etc. They belong. You don't seem to care, thinking only about the money they would get if they sell. You do so because you ate footloose and fancy free and have no roots anywhere. You are not normal. Most of the people on earth are rooted in places. I think your attitude is rather cavalier. Attachment to place is a form of the sacred.
Why should an elderly person's sense of attachment trump the ability of other people to afford to live in the same place by artificially reducing the available housing stock, force other people to pay more in sales taxes, lead to financial instability for the state, and everything else that I mentioned?
This isn't just a money vs. roots debate, the decision to give elderly landowners huge tax benefits has very real costs to everyone else that they have to bear. What about the next generation of people who never get a chance to establish roots there because they can't afford it due to all the preferential treatment given to old, established property owners?