Currently, Foreign Service personnel are obliged to retire at the age of 65, whether or not they actually want to retire. While this may be to my personal advantage (I am a mid-level Foreign Service employee, and it guarantees at least some slots will open up at higher grades), the government could save money in recruitment, training, etc by simply increasing the mandatory retirement age - or getting rid of it altogether. Let's face it: with the improvements we've made in healthcare and life expectancy in the past few decades, 65 leaves a lot of potentially productive years ahead of a person.
Idea No. 6011