Increase in height is the growing over the one’s determined length. Human height is determined by a combination of genetics and environmental factors. Human height has steadily increased over the past two centuries across the globe. This trend is in line with general improvements in health and nutrition during this period. 

It is considered that after a particular age, height stops increasing. Women height increases up to the age of 18 and for men up to the age of 24. The long bones (femur / thigh bone and humerus / upper arm bone) grow to their correct length under in the influence of growth hormone. Normally at puberty oestrogen or testosterone causes the end plates of these bones to fuse and harden to prevent any further growth.

Increase in height may be associated with several diseases including:

Kallmann syndrome

Kallmann’s syndrome is a type of hypogonadotropic hypogonadism which affects males and females and is characterized by eunuchoidal habitus (tall, slim and underweight), lack of sexual development, and anosmia, caused by a defective development of the olfactory bulbs. If for any reason oestrogen or testosterone are missing, as in Kallmann syndrome, the bones (in the arms and legs) do not stop growing and continue past their pre-determined length if the treatment is delayed.

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Sources

Kallmann syndrome ―sourced from Wikipedia licensed under CC BY-SA 3.0
Human Height ―by Roser licensed under CC BY-SA 4.0
Is it Still Possible to Increase Height After 25? ―sourced from e-Buddhism licensed under CC BY 4.0
Kallmann’s syndrome: A propos of a case ―by Jubiz and Cruz licensed under CC BY 3.0
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