Retirees say that saving and investing for retirement consistently is critical, as investing can help grow savings over many years. Sometimes, the simplest strategies are best — one retired grandfather used a buy-and-hold stock strategy to build a portfolio worth millions. Luckily, lots of people have retired comfortably and are willing to share the steps they took to do so. Here, we've compiled the best advice from four retired people for anyone who's looking forward to a long and happy retirement. Sean says that his grandfather's advice has helped him get on track to hit $6.8 million at age 60, or retire early.

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