Note that age discrimination in employment/recruitment decisions is unlawful and punishable by pretty significant fines and civil judgements.
Note also that the threshold isn't whether discrimination actually occurred, it's whether it was reasonable for you to form the belief that it did.
Which is a pretty low bar, and should persuade employers who don't want expensive litigation to go absolutely nowhere near age discrimination.
You shouldn't put your date of birth on your CV. You shouldn't tell recruiters how old you are. There is no reason to know, it's not a relevant factor they can use to decide whether or not to employ you.
Some employers have bad (or no) legal advice and don't behave professionally. Fair Work Ombudsman complaints are free, so you can go hammer-and-tong against those businesses if they step out of line.
https://www.abc.net.au/news/2025-07-21/ageism-work-employers-age-bias-hiring/105543944