For our next session we can first have a negotiation on whether or not retirement should be abolished. After reaching consensus in reference to retaining it, we can further discuss the issue of mandatory retirement.
Here is a link for a Guardian article arguing for abolishing retirement. You may also want to read the comments underneath the article.
Here is a link for an online debate on abolishing social security.
Here is a link for a webpage with the pros and cons of mandatory retirement.