You may set any date of birth. Verification is not required so we will not ever ask you to confirm your DOB somehow.
This is the responsibility of the casino to give a full list of the restricted countries. And all other casino does it in their T&C page. But it's different in your casino. Suggest your boss to give a list of the restricted countries.
Those T&C were taken from another our brand and will be changed soon. All countries are welcome, no restrictions.
Glad that it was pointed out and OP will soon correct it, gambling operators should come out with their own rules that they can implement within their means if they bought a template they should have access to how to edit it, TOS is very important this is the cause of many accusations and players misinterpreting the rules, it's either OP is not aware of this or this is his first casino.