Eating healthy fruits and vegatables and avoiding processed foods that have high fructose corn syrup can help you loos some of the weight. Of course walking, biking, and weights also help muscle and bone.
When it comes to jeans, buy streight legs and up to, or close to the waist. There are some jeans that have an elastic waist band. They are great. Lee makes good ones. Do not buy jeans that are tight fitting. Buy loose and streight leg. Long sox up to the knees under the jeans will keep you nice and warm. Jeans are great at any age.