How can I increase my penis size. My age is 22. Any exercise?

Unfortunately. . Unfortunately there is no exercise. You can do kegels to get better control but it does not affect size. There are surgical procedures that can help.
Get excited. Once you've completed puberty, your penis won't increase in size anymore (aside from temporary enlargement due to getting erect during sexual activity). Contrary to popular belief, there is no exercise to lengthen or enlarge girth. And to preempt the standard follow up question, check out http://blogs.Menshealth.Com/girl-next-door/the-length-of-the-average-penis%e2%80%94revealed/.