As far as I knew and AGL will correct me, your plan offering is based on your state and if you have solar etc. so I am not sure of the relevance of your DOB. I'll look out for AGL's reply to learn more myself.
Wih mine in SA I simply went to the SA part of pland available, chose solar and there were my choices. Times have changed and I am now on VPP here so my choices are limited but am happy with what is offered to me.
Please remember I am just like you - a customer. If my post has helped, you can click the 'LIKE' button to show your appreciation.