At what age do boys generally complete their rapid growth stage?

The answer is sixteen (16). At the age of sixteen boys commonly complete their rapid growth stage. During this stage of puberty, growth spurt maximizes, so as body portions change, like the trunk of the body, and the legs as well. During sexual maturation, they may also experience changes in their voice, body build and the appearance of pubic hair and face maturation may be at its full extent.