I am sure the consensus here will be a resounding: Absolutely!!!
You can do this. Any one can. However, how badly do you want it?
As it has already been stated in Mark's book and this site, your diet will dictate 80% of your physical result. You will need to be disciplined and probably need some support from the family. Don't look at this as a diet, but as a new way of eating for life. This isn't a weight loss program. In fact it has been clearly articulated by Mark and I agree, that eating primally and working out will get your body to where it should be. The benefit being that, where your body should be is a place where it is lean, strong, vital and sustainable without making you feel worn down and unhappy.
You will quite literally get out of this what you put into it. That having been said, what is your motivation? Write it down! Tape it up somewhere! Be able to clearly and unwaveringly recite why it is you want this change and how you are going to do it. For me, that was seeing a photo of myself and realizing that was not what I wanted to look like. I didn't really pick a weight to achieve, or a time limit to do it in. I just started eating primally and doing the type of workouts I enjoyed that mirrored what was in Mark's book, i.e. lift heavy things, move quickly, play/rest, etc.
Give yourself no room for variation or cheat days. In for a dime in for a dollar--how else could you say you honestly tried? Any thing less is half-hearted and half-assed. You and your family deserve your BEST effort.