Kuvusa

Every Saiyan went through it, their version of puberty. It usually occurred around the age of sixteen, sometimes fifteen, very occasionally fourteen, and it wasn't a big deal. One day of self-care-in all senses of the word-and a Saiyan was over it the next day. Vegeta went through it himself and was fine.

Goku, though, had his tail cut off too early.

Vegeta found this out first hand, a year into training inside the Room of Spirit and Time.