Do you feel like working at least until you reach the age of 70. Many Americans could retire safely at that age, according to a new study from the Center for Retirement Research at Boston College.  The study shows about 86-percent of American households are currently on track to retire with financial security at the age of 70.  On the other hand, only 30-percent of American households will be prepared to retire at age 62.  That's the earliest age you can begin claiming Social Security.  And only 49-percent of households are on track to retire at age 65.