Tara Driver would love to retire before age 70. But it’s not going to be easy. The 51-year-old’s finances are still recovering from the hit they took more than a decade ago, when she spent about eight years caring for her ailing father. Sign up for The Morning newsletter from the New York Times During that time, every extra dollar went to pay for supplies and care for him, a veteran who died after a series of strokes and other complications. When she lost her job as an academic adviser because h