There is no age limit to study. I am 31 and got AIP.
1st thing is you find and appropriate program and school which accepts you. Many schools dont accept academic gap more than 5 years ( like George brown College Torronto)
Go for University.
In this forums, a guy posted about his approval with 14 years of academic gap ( having professional experience)
Choose your program related to your bachelor's, justify your experience and future planning