For 3 years? It is too long, maybe you can convince the Sportsbet regarding that, it's just about your age, at least you didn't lie about it and you are done with KYC. As long as gambling is legal in your country, that is a much large case compare to age only. There are a lot of people there lied about their age, just talk to their support either on their live chat on the website or here.
ikr... I tried to convince them but it seems to be of no use..they are seemingly lenient to those who lie and strict to someone who gave them the right info for kyc..dissapointed