rule of 90
n.— «Many boomers are approaching what’s called the “rule of 90″—the sum of age and years of employment required to qualify for a full pension under the Minnesota Public Employees Retirement Association system.» —“Retiring boomers will leave cities big shoes to fill” by Mary Divine Pioneer Press (St. Paul, Minn.) Apr. 2, 2006. (source: Double-Tongued Dictionary)
Further reading
Joey from Orono, Minnesota, has been learning Italian and its many idioms, which makes him wonder if there are other languages that can simply be learned in a classroom without input from a larger cultural context of new and evolving expressions...
There was a time when William Shakespeare was just another little seven-year-old in school. Classes in his day were demanding — and all in Latin. A new book argues that this rigorous curriculum actually nurtured the creativity that later flourished...