Listen to me:

You are 27 years old. You are mature now. You can make your own decisions. You must not feel guilty about moving out and going to be out living on your own. I understand that your parents need your help at this point in time, but your parents are adults who should be responsible enough to not have to rely on their child for assistance. It is not your fault in any way and like I said, do not feel guilty or depressed about this entire situation. Your parents can both support themselves, if not they shall learn to live within their means like the rest of the world should.

Live your own life. They have lived theirs and you have contributed enough as it is. You do not owe anything to anybody, even if they are your parents. If you wanted you could always help them out once in a while if they really needed it even after you move out, but by NO means allow them to make you feel guilty about making this choice in your life. It is your life, now live it on your own.