It is assumed by most that once you have reached your mid twenties, the growth process has stopped. However, whilst height is developed in the main throughout early life, there are ways to grow taller later in life; or certainly give the appearance of greater height.
The majority of people hunch over when they are standing; spend some time just looking at people, it will soon become clear. By correcting your posture therefore, as much as three or four inches can be added to a person's height.
To improve posture, ensure you have a straight back, your shoulders are pushed back, your chest is lifted ever so slightly upwards, and your chest is pushed out. It can be all to easy to slouch when typing to, so follow the same course and your standing posture will increase, as well as alleviate any back issues you may experience.
Posture can also be helped by taking adequate rest. At times of the rest, the body is allowed to recuperate itself from the daily activities. As a child, most development is of course completed throughout the night however; it is not just whilst sleeping that rest can be earned.
Try spending some time to lay out straight, ideally on a hard surface for a few moments each day. Throughout the day, the spine is compressed through the force of gravity, (it is one of the reasons why we all tend to shrink as we get older), allowing time for the spine to decompress allows for a certain amount of recovery.
This can of course also be gained thorough sleep, though as we tend to sleep on soft mattresses, the effects are not as impressive. However, do try to have at least four hours of sleep each night and ideally no more than six or seven.
Whilst increasing posture enhances your height; in allowing you actually be your full height rather than a restricted version of it, there are other options you can try, that can actually add inches.
Contrary to popular belief, there are some exercises that will add inches through elongation of the limbs and flexibility of the limbs. These tend not to be exercises that improve the muscle structure of course, (which can in fact reduce height), but more along the lines of yoga and Pilates.
Finally, take a look at your nutrition and diet. As with most things, this is a fundamental element of a healthy lifestyle; and such sentiments can be applied to height gain. Look to eat high protein foods such as chicken, beef, eggs and nuts, and increase the intake of fresh vegetables and fruit. These allow the body to recover quickly and repair itself well. Increasing calcium intake with milk and other dairy products will also be useful to promote healthy bone structure.
Finally, when looking for ways to grow taller; bear in mind things that actually stunt growth such as; smoking, coffee and other such products. Keeping these to a minimum, or eradicating them completely will help a great deal.