Thats the mother load right there, follow that up and you won't need to work again...
Sadly, discrimination complaints seldom find even the bastard son, let alone the mother, but I strongly encourage you to pursue your rights vigorously.
The threats would possibly open a victimisation/harassment claim as well as one of age discrimination...it's certainly an aggravation.
Talk to your legal team about which legislation they will be lodging the complaints under. Ask them who they will be briefing, especially if going to the Federal Court. I have briefed Fiona McLeod SC who practises out of Melbourne. Strongly suggest you seek an opinion from her if she is available.
Kaz