There’s nothing special about the number 65. 100 years ago when the retirement industry was in its infancy, 65 year old men had a life expectancy of about a decade. Women could look forward to an extra year or two. As a result a pension for a 65 year old was relatively affordable. Now the situation is very different. You may live another 30 or 40 years from 65. What are you going to do with all those years? How will you afford it? This article in the New York Times explores some of the consequences of this change. https://www.nytimes.com/2018/12/30/business/retirement/why-the-world-needs-to-rethink-retirement.html