At, 65 is it hard to lose weight?

Yes. At any age is hard to lose weight. If a pt is losing weight involuntarily at that age we have to rule out cancers, thyroid disease, malabsorption, depression, dementia and other conditions?
Yes you can. You can lose weight at any age. It does mean you must be consistent you should have a medical evaluation first. You need to start a gentle walking program and a structured diet. You could consider a personal trainer. You can start with your area ymca. They tend to have excellent programs for seniors.