Final answer:
In boys, puberty generally begins around the age of 11 to 12 years and is completed by the age of 18.
Step-by-step explanation:
The first signs of puberty in boys include growth and development of the external genitals, such as the testes and scrotum, as well as the growth of pubic hair and deepening of the voice. This is followed by the growth axillary and facial hair, and the occurrence of the first fertile ejaculations. The timing and pace of puberty can vary individually, but overall, boys typically complete puberty by the age of 18.