Police Academy / Police Jobs/ Prison Jobs/ Etc... ( MASSACHUSETTS )?

Hello there, I got numerous questions falling in to the Criminal Justice branch. First question, I will like to know if any of you guys have some knowledge on what is the minimum age requirement to go to the police academy in the states of Massachusetts. Also, is there any website I can visit to apply? Secondly, In the state of Massachusetts, what's the age requirement to work on prison as a CEO. I'm very interested on becoming a police officer on the state of Massachusetts. I'm currently 19 years old, and I'm also going for my second year on college taking Criminal Justice. Please, assist me with websites and knowledge on this questions. :)