The number one worry among older Americans is running out of money over the course of their lifetime. In this month’s issue, AARP Bulletin reveals that the key to preventing this is knowing one essential number: how much money you will be able to afford to spend each month and from there, adjusting your expenses accordingly. AARP’s financial expert Jane Bryant Quinn provides an easy-to-use process for finding a sustainable income for life—regardless of your current income level, marital and housing status, or the size of your savings.