I am 22, about 80kg and 62. is there still any chance of me gaining about an inch and half or maybe an inch in height?. i know the internet says 21 is the stop. but i ask this because my cousin gained about 2inches at age 23 prior to turning 24?

Cousin an exception: It is very unlikely that you will gain height? Did you gain any height in the previous year? Have a healthy diet, exercise 30 minutes/day, drink plenty of water daily so your urine is mostly colorless, have safe sex, no tobacco alcohol weed or street drugs. For nutrition: http://www.choosemyplate.gov/. Safe sex: https://www.hopkinsmedicine.org/health/wellness-and-prevention/safer-sex-guidelines