Many plan to work well into their 60s or even 70s, thinking they can compensate for years of undersaving. But according to recent surveys, retirement may come earlier than expected for many Americans – whether they're ready for it or not. The average retirement age in the U.S. is about 62 years old, even though most workers expect to retire around 67. In fact, more than 56% of retirees left the workforce earlier than they planned, according to a Transamerica survey. So, what's causing this gap b