The applicant alleged age discrimination under the Human Rights Code after his health benefits ended at age 65.
The Tribunal previously found that s. 25(2.1) of the Code is a complete defence unless it is found unconstitutional.
Two teachers' unions, OECTA and ETFO, sought intervenor status to address the constitutional issues.
The respondent and the Attorney General requested limitations on their participation, including a requirement to act jointly.
The Tribunal granted the unions full intervenor status without the requested limitations, finding that their perspectives on the administration of benefits and the impact on older workers would assist the Tribunal in this significant constitutional challenge.