I agree with Pegasus--any height gained would be due to your spine being decompressed (hence why astronauts return to earth taller--no gravity in space--although this is only temporary). Growth hormone (HGH) would have no effect in an adult (of any age) passed puberty, as the growth plates in the long bones (ie: your legs) have fused. In other words, even if you were to shoot up obscene amounts of human growth hormone, it would have no effect on your height (but it would likely distort other parts of your body like your skull, hands, and feet). Even growth hormone injections in a currently growing adolescent (who has otherwise normal levels) can only impact your adult height by so much (maybe adding a few inches). In other words, genetics pretty much determine height, and unlike your penis, there is very little that can be done to augment it.
Most boys are done growing between 16-18--some sooner, and some into their late teens/very early 20's. As far as I know, the only way to increase height post puberty is through surgical intervention, which essentially requires either the femurs or tibias of both legs be broken, an internal rod inserted, and the bone to be slowly lengthened over a period of months. Contrary to what one may think, cosmetic limb lengthening has come a long way, and is not as involved or painful as it once was (although it is still a very major procedure and a significant psychological undertaking for the patient willing to undergo it).
Most boys are done growing between 16-18--some sooner, and some into their late teens/very early 20's. As far as I know, the only way to increase height post puberty is through surgical intervention, which essentially requires either the femurs or tibias of both legs be broken, an internal rod inserted, and the bone to be slowly lengthened over a period of months. Contrary to what one may think, cosmetic limb lengthening has come a long way, and is not as involved or painful as it once was (although it is still a very major procedure and a significant psychological undertaking for the patient willing to undergo it).

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