Seventy might feel like fifty in Scandinavian cities where cycling is part of daily life—but try that in the U.S., and the idea of retirement quickly becomes a parody.
The US already has a retirement age of 70 depending upon how you figure it. As noted in sibling comment, depending upon various factors, that's the age it's generally recommended to start receiving social security benefits unless you want/need smaller payouts sooner. Medicare starts at 65 however. IRAs don't require you to take distributions until you're 73.