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Growth of the voice box is usually between the age of 14 -15 years. It is this time when brain adapts to the longer membranes within your voice box, the adult type voice develops.
The rate of penile growth varies from everyone and depends on genetic factors (from the father), Nutrition and psychological development. The growth of penis and testicles usually starts by the age of 9, but it continues upto the age of 18. The growth rate spurt will be maximum between 15 -18 years. Your penis, testes and scrotum will be reaching full adult size by the age of 20 years. At full maturity, your penis will be about 3.25 to 4.25 inches at rest and 5 to 7 inches while erect.
In case, of doubt or anxiety, you may consult with your doctor, who can examine you can clear all your doubts.