If you have done any research on retirement, you have likely read that the No. 1 concern for retirees is that they will outlive their money.
This is a valid concern due to several factors. Americans are living longer. Health care costs are rising. Pensions (defined-benefit plans) are a thing of the past. Today, many retirees are nearly 100% dependent on Social Security and whatever money they have been able to stash away in retirement plans, such as IRAs, 401(k)s, 403(b)s, etc.
https://finance.yahoo.com/news/dont-let-fear-spending-spoil-124101717.html