The Roman poet Decimius Magnus Ausonius (say that three times fast) once said: “Let us never know what old age is. Let us know the happiness time brings, not count the years.”
This is great advice for how to live. It’s not, however, great advice for how to plan for retirement. In fact, there are several key retirement ages that trigger important events for current and future retirees. Here are the retirement birthdays you should mark on your calendar.