Living longer doesn't just extend the tail end of life, it extends the retirement age as well. Humans spend 20 years learning & work for 40. Imagine if we could work for 80 instead!!
Not to mention the productivity gains of having people who have the experience of workers in their 40's with the energy levels of people in their 30's would be a big productivity boon.
You mean work for 45-50 years :( they will likely move the retirement age from 67 to 70 in europoor. Some people start working fulltime at like 15-16.