Currently, there is no age limit to CEC.
There is a proposal to change the Federal Skilled Workers (FSW) class to favor younger over older workers; currently the point system awards an increasing number of points to older workers, up to the age of 50 (then no points). If approved, this change will reverse that.
I have NOT heard of any such proposals for the CEC class. There is no point system for CEC. But it is not impossible, changes can be made at any time.