Vegeta used the Dragon Balls to grow taller during the 3 years before the Androids, this is canon. maybe his bones have grown while living in the earth's less gravity.

Did Vegeta get taller in GT?

As you all already know,Vegeta used to be short in the Saiyan Saga,but grew taller each arc,being of average height in both Cell and Buu Saga. He got even taller in both DBS and GT,being now taller than most humans !

How tall is Vegeta 2020?

10 How Tall Is Vegeta? Officially stated in the Daizenshuu 7: Dragon Ball Encyclopedia, Vegeta's height is listed as 5'5", making him one of the shorter extraterrestrial warriors in the Z-Fighters.