Jack_the_sparow / Shutterstock.com Quick Read If you’re thinking to retirement, nearing retirement, or already there, one of the last things you want to worry about is cash flow. You want to ensure that you’re not part of the nearly two in three Americans (64%) who worry about running out of money more than dying. One of the best ways to do that is by investing in passive income and growth, which investors can accomplish with Vanguard exchange-traded funds (ETFs). If you’re thinking about retiring ...