There are many ways to consider what you feel will be required in retirement. Plus many ways to do it.

The ways will change with the generations. It becomes an equation with a lot of variables or intangiables . Mind the aspect that nobody really knows the future. Doing something is still mandatory of course.

I expect interest will remain very low for the next decade or two yet there is no way to be sure. Other than it might impact earnings on investments. Inflation has been pretty constant over our working years. The severity or lack of severity in the future is yet another serious potential issue.

Assuming the buying power in the future is the really dangerous component. For example what we as a couple could actually live on twenty years ago probably would only cover the groceries today is pretty much factual in Canada anyways.