Hello !! I Want To Ask You The Next Thing

hello !! I want to ask you the next thing can I still grow at my age im 28 ?or it is impossible already? because some information on the web says that you can grow at any age !! you may have seen those sites that offers systems at exercises and diet plans to achieve that? it is true or is a lie I would like to know a doctors opinion!! and if it is possible to increase my height at least 1 to 2 inches what should I do?? is there actually any secret for increase ones height? thanks for your attention