Mandatory Retirement Ages for Lawyers - Should They Be Abolished?

The National Law Journal reports today that the American Bar Association is recommending that mandatory retirement ages for lawyers be abolished.  I probably sound a bit insensitive but I'm curious why this is an important issue for the ABA?  Are a number of lawyers complaining that after clocking in enormous billable hours they want to continue working for their large law firms after 65?  Me, I hope to retire by then....