Abdominoplasty vs. liposuction
More important than your age are your current state of health, the condition of your belly, what you want changed and what degree of change will satisfy you. None of these factors can be discerned from your post so your question cannot be answered specifically for you. In general 65 is currently not too old for liposuction if the patient is a good candidate for it.
I hope you realize that this format of posting questions and receiving answers lacks the face to face direct communication...