Using this ability, Chris, Miles, Becca and Kokone can all manipulate a person's age, maturity and physical size, all by manipulating growth. They can alter physical age, age a person until this becomes fatal, shrink a person and grow someone to enormous size. They are able to use the ability on themselves, on other people and on any other living thing. The ability can also be used to inflict and to heal tumours, since these are caused by uncontrolled tissue growth. Miles is known to have used this ability to age himself up roughly 14 years, after his mother was arrested and he had to take care of himself.