As you said you have played Cricket in your childhood and now practicing with Tennis ball, I think you are quite aware of the rules of the game. Age is no bar for joining any Cricket club and all that matters is how you practice there and become stronger in the game. Joining a Cricket club would help you to know the intricacies of the game and give you the best practice. It helps you in playing the local tournaments organised by various agencies and your best caliber may give you a chance in League matches, Ranji trophy and other domestic cricket matches. Take the example of Arshad Ayub, the former test cricketer who joined the national team in 1987 at the age of 29 after soem good performance in Ranji trophy representing Hyderabad team. Ayub made his debut against West Indies in 1987-88 and .played in 13 Tests and 32 ODIs from 1987 to 1990. He is heading the Ayub Cricket Academy at Hyderabad and an inspiration for any late entrant in Cricket.