@MojangSupport I've had this issue for several years now, but I was never able find any solutions to this problem. My date of birth on my Minecraft/Mojang account is incorrect despite it being correct for the first few years after I bought the game. I also can't change my email.
Please send us an email at https://help.minecraft.net/hc/en-us/requests/new … and we will assist. Remember to attach your Transaction ID. ^RL