I believe that I meet the requirements for the Deferred Action for Young people, how much information should I tell about me when its time to apply?

I''ve been here since the age of 9, I''m now 26. I have a high school diploma, been pulled over 3 times and got tickets for 2 for bad break lights but I''ve paid my tickets for no licence and no insurance. I have never left the country since I''ve moved here. My question is will it affect me that I''m working right now under another name? I''ve done my taxes with my Itin number. I also have government assistant for my 6 year old son, a born citizen and its medicade. When I applied for the medicade I wasn''t working but since I''ve started I never let them know that and I didn''t change it. Should I let them know that? Also is it true that once someone reaches the age of 30 they wont be able to apply for that again? I would appreciate your advice as soon as possible thank you.