Takes away the age of your car.
I agree !.
I learnt this lesson about twenty years ago, when I bought my first private plate !.
Disguise’s the age of your car as
@Vipar correctly states.
My wife’s Fiat 500 was purchased new in 2016 it has only covered about 13,000 miles and is in showroom condition.
The car is almost six years old now, but you would never know it !.
The shape is still current so the plate hides it real age of the car really well.
A few people have remarked on its condition and asked how old is the car ?.
I ask them to guess and they never get it right, most say 6 - 12 months.
Job done

private number plate !.
My wife said she would love an easy method to hide her own age ?.
Our plate for the new Trophy is sitting on a retention document at the moment, due to the back log at DVLA.
As soon as the V5 arrives, the plates will go onto the car.
I don’t go for this new number plate game.
Only the public purchases cars on the number on the plate, dealers buy on the first date of registration.
I would never register a new car just before Xmas.
In less than a week, the car flips a year at the time of resale.