The Harvard study we read during our housing discussion looked at retirement age households and their cost burdens (i.e. paying more than 30% of their income for housing as rent or mortgage payments). What trend are we seeing in the number of retirement age households that are facing cost burdens? The number of retirement age households facing cost burdens has remained the same The number of retirement age households facing cost burdens has slowly decreased The number of retirement age households facing cost burdens has reached an all-time high. The number of retirement age households facing cost burdens has sharply decreased