If retirement planning had a soundtrack, a great candidate would be “Love and Marriage,” the old Sammy Kahn lyric made famous by Frank Sinatra: Love and marriage, love and marriage . . go together like a horse and carriage . . .So much planning advice focuses on married couples–and no doubt, that’s where some of the most valuable retirement benefits can be found. Think Social Security spousal benefits, joint and survivor pensions, or beneficiary rights for 401(k) and IRA accounts. At Retirement Revised