@Saintsman. Ridiculous, as you say.
I really hope that the apparent ‘change’ of DOB doesn’t trigger the famous “change of circumstances” which the DWP are known for. That might also trigger a PIP re-assessment!
It’s one reason why Mrs 72 dudes hasn’t paid in her £50 cheque from Motability and probably won’t as it’s in her previous surname which she changed by deedpole 2 years ago. The bank won’t accept it even though she took her passport (old name), driving license (old name) official deedpole paperwork (new name) and a recent bill (new name), all showing current address. Bank acount was changed from old name to new name, yet PIP/ESA still get successfully paid in!
She’s too scared to change her name with DWP in case it triggers a whole world of complications.