For age discrimination complaints you would contact the Human Rights Commission. They have no powers though, as they can only mediate and run a conciliation session, even if it is blatantly obvious that age discrimination is taking place. If the employer says get lost, there is nothing further they can do and the employer is not obliged to even respond.
Then you have to find your own lawyer and request a hearing at your local courthouse. If you lose, you run the risk of costs being awarded against you, not to mention your own costs.
Law firms do not to “no win, no fee” pro bono for human rights cases, so you’re on your own with the costs.
In summary, don’t try and go down that path as you won’t get anywhere !