Core Insights - Starting to invest in one's late 30s can still lead to a successful retirement with financial discipline and long-term commitment [1] Investment Strategies - Opening a retirement account, particularly a Roth IRA, is recommended as it allows tax-free withdrawals and capital gains [3] - Contributing to an employer's 401(k) plan is advantageous due to higher annual contribution limits and potential matching contributions [4] - Investing in index funds, such as the Vanguard S&P 500 ETF, is suggested for stable investments with some risk [5][6] - Index funds provide a hands-off investment approach, allowing for automatic contributions from paychecks [7]