I used to be moderately active for almost two decades then some injuries and arthritis set in and I went from that to a total couch potato.
I have recently started back both exercising and dieting to lose weight---about 135 lbs.
I am currently following the WW Flex Point Plan which does allow counting exercise points "earned", if I understand it correctly. It goes without saying that if you are active you are burning calories---otherwise why would you be sweating?
I keep track of my "activity" points for two reasons: 1) so I know exactly what I am doing, how I am progressing,etc. 2) so I can fuel that activity.
I realize not every one enjoys being active but I do. In just two months time, I am now up to walking 2 mph on my treadmill 30 min a daily 5x a week; doing upper body free weights ( 5 lbs) 3x a week and doing abs 5x a week and recently added Pilates lower body and dancing dvds on the weekends (I work full time).
Because of exercise, I have the energy to work full time, do all of our cooking (from scratch--l'm leaning towards the Sonoma diet that I've been reading about here), light housework (I live in a 2 bedroom apt so I'm not going to fool myself it is any thing more than that), increase my "love life"

and do errands on Saturdays. Oh, I am 54 years old too.
I did go on the website you mentioned. I had never heard of it! Thanks!
According to that I should eat about 2000 calories to lose two pounds a week. That seem to fit in with the WW Flex Plan I am currently following.
I have lost 16 lbs since September 1st and I am sure I have lost inches. When I lose 25 lbs I'll measure myself again and see.
Remember being active will help you burn those calories, it will increase your metabolism and it just plain makes you feel better---physically and mentally.