I think for this reason, millienials and/or gen z will force the retirement age being moved to age 70 or dropped altogether. Many millenials and gen z are childless or have a small number of children. I significant portion also dont have any religious beliefs. With aging comes changing priorities and views on life. I think the need for having a purpose in life will cause a change in attitudes. When you are 55 or 60, you cant necessarily do all the things you loved in your 20s and 30s. Everyone I know in retirement either has grandchildren that keep them busy or a church that keeps them busy. None can party or travel like they were able in their younger years and health problems further limit things they used to be able to do. A significant amount of their friends have gradually died due to cancer, heart attacks or natural aging process. Everyone wants to retire young until the reality of how boring retirement can be sets in. You can ask someone who is 100 years old and still walks 2 miles a day how he did it: by always staying busy and having a purpose where he was needed.