Sport help needed

Im normally on the disco section as i have a td5 disco but my dad has a range rover sport v8d hse,now he loves the motor to bits but being as him and lovely mum are in there 70s he finds the ride a bit hard.Now i know you are going to say he should have brought the vouge but he saw this and had to have it.My question is if he to replaced his 20inch rims for 19s so it would have a higher profile would it make much difference, or can the susspension be alltered any advice would be appreciated thanks

In my experience the difference between 20" & 19" is noticeable, but it is still a far stiffer ride than either the Range Rover or Discovery