It's documented: Retirement hurts a nation's GDP growth and the individual's well-being. All that juicy research is presented in an opinion-editorial in The Wall Street Journal by Nicholas Eberstadt and Michael W. Hodin. Here you can read it (sub. req.)
So, providing incentives for those over-65 not to retire, employers to hire us and customers/clients to buy from us (e.g. 10% discount for those purchasing from senior enterprise) is good for America. Over time, as the Nihon University Population Research Institute in Japan found, GDP growth could increase about 10 percent in 20 years.
Also, anyone who resides in senior housing has witnessed a binary phenomenon: Those working are a delight to be around. Those who don't work tend to be a sort of public nuisance. They complain. They feel entitled to special consideration. They create a glaze-over zone with their verbosity. The longer they behave that way the more isolated they become. The more isolated they become the more their quality of life falls off the cliff. Medical bills surge. The ambulance comes regularly for X or Y health problems.
Sigmund Freud was right: What's key in life is work and love. If we continue to work the law of attraction kicks in. People move toward us. We are bonded with those who care about us.