how to keep on track when over 80 !

Wonderful site , my daughter introduced it to me , when she lost 55 pounds and ran a San Fransico Marathon to commemorate her brother, my son who died of Cancar , a year ago .
I am over 80 , still in good health , do light exercises and weights , but do have a problem walking ,especially in winter in snow - my husband and I love to RV - we were Military so moved all over every two years or so . After our children, all born in different places , and quitting smoking , I piled on a lot of pounds . Lost some 30 with WW , but back it came as I love to cook and make marvellous bread !
I want to lose about twenty pounds so that I can breathe better and walk more , especially when we go camping .
A very real help to me has been my diet soup , very low calorie wise and quite tasty...
Here it is :
One package o Knorr or Lipton Onion soupmix
2-3 stalks chopped celery
1 -32 oz can of diced or whole tomatoes
2 large white onions , chopped .
2 garlic cloves , chopped
1 can cut plain green beans
1 or 2 Bayleaves
1/4 tsp of powdered Cayenne ( suit to taste by trying )
1/4 shredded to bite size green cabbage
12 or so cups of water

Method :
Place water in large soup pot , add Onion soup mix , add all vegetables , and bring to a boil . Lower heat and cook until cabbage/celery /onions etc are soft . Remove Bayleaf , add more water as desired .
Less than 100 calories for a 2 cup bowl and filling , a Couple of Rice Cakes or 1 slice of bread and its a good hot healthy meal .