This raises the question: how long can one actually remain insured in the pension fund and continue saving for old age?
Provided the pension regulations allow for it and the person continues in gainful employment, they can remain insured in the pension fund until age 70. This means they can continue to accumulate retirement credits beyond the reference age of 65 and thus noticeably increase their savings. The continued insurance is tied to two conditions: first, the pension fund's regulations must provide for this option at all, and second, the person must actually continue working. So it is not age 62, age 65 or age 68 that is the upper limit, but age 70.
This rule takes account of increased life expectancy and changed working biographies. Anyone who works longer can specifically strengthen their provision in these additional years, which can be valuable especially in view of falling conversion rates. A look at one's own regulations and a conversation with the pension fund are worthwhile if a longer working life is planned.