I am in my mid 50s, not over 60, but have suffered from some major injuries and broken bones (including back and neck). Just getting moving every day can be a major victory. Discipline in your diet, focusing on portion control, snacking and quality, can also be very significant to your progress. Small victories, and then turn them into large victories. Build good habits, and break bad ones. Lean muscle mass burns more calories, so working the entire body helps. An kind of resistance will work the muscles, find something that works for you. The solutions that other people have found may work for them, but may not work so well for you. Try them, but don't build a wellness program around other peoples' solutions.

That is the other key, you need an entire wellness program, that includes all aspects of your life. But it needs to work for you and your unique situation. Experiment, seek information (there is a lot out there, but there is a lot of bad as well). The people around you need to understand what you are trying to do, and be supportive of it. It will help tremendously.

Regardless of religion or belief system, do not neglect the spiritual/moral/emotional aspects. Even if you are an avowed atheist, understanding what you are feeling and why is important. Mindfulness may sound all touchy feely, but meditation works for everyone. It does take practice though. It can aid in managing stress and help you maintain the discipline necessary for such a major lifestyle change.

Good luck and never give up!