SF discount 30% with 27 years

I’ve had my driver’s license for more than 9 years and have been driving nearly 300000 km since then without a self-inflicted accident and no significant parking tickets. However, my cars were always registered on my father or mother. Currently my car runs on my mother with an SF discount of 30% (Allianz). Now I had hoped that I could take over this 30% by now. However, according to Allianz insurance, this is not possible, since I have not yet reached them because of my age. Has any of you had a different (= better) experience with another insurance? Greetings, Holger P.S. I didn’t find anything in the FAQs or in the forum. If there was a topic before, then I would be grateful for a link.