Worried about private reg

[Dentz]

Just bought a private reg recently and im waiting for the documents from the owner so i can transfer it onto my vehicle.

However tonight i was thinking, i remember someone here saying something along the lines of "your car needs to be older than the reg, so people dont try and make there vehicle's look younger with newer numbers plates".

So basically if this rule is true, i think ive had it :/

My car is a V Reg 1999 and the reg i have purchased starts with Y.

V is before Y, soooooo

Maybe im wrong and the rule doesnt apply like this.

Id be thankfull of any help