I strongly recommend not dating someone nearly three times your age. In fact, strongly isn't strong enough. I am begging you to not date someone nearly three times your age.
Dating someone that much older is going to isolate you quite a bit from your friends. Do you think a 52 year old will want to go to a house party with teenagers? Or head down to West Palm for spring break? Would you ever get used to the stares and (I'm being honest) ridicule that you'd get from holding hands with someone that some people might think is your grandfather?
I'm a bit concerned for you, truth be told. You were fired from a job and you're considering giving your number to a guy that is likely older than your parents. Are you close with your family? Do they have any thoughts on this situation? I hate to be an overly boring voice of reason here, but I kind of need to be the overly boring voice of reason. Please take a long, hard look at your situation and think about whether or not you're happy.
Good luck, and please make a good choice here.