Investing in retirement accounts like IRAs and 401(k)s offers tax advantages, as contributions are tax-deductible and earnings are tax-deferred until withdrawal. However, starting at age 73, individuals must take required minimum distributions (RMDs), which can create a tax burden if reinvested improperly. Taking RMDs during market downturns can be beneficial, as it allows investors to withdraw more shares, reinvest them in taxable accounts for potentially lower capital gains taxes, and reduce future RMDs.