I'm a healthy 23 yr-old 5"10, 230lb male who is half Native American and Italian. I have a penis size of about 6 inches but over the last three months has grown about 1/2 inch.I have been engaging in more sexual activity lately, as well as exercising more frequently over the last few months, and was unsure of what could be the cause of this. Is this possible at my age for my penis to continue to grow?