First off, I agree with Tirzah. I would say if you do not plan to go through treatment then No dont subject your body to a biopsy.
But, I also would like to add that cancer treatments are really rough and miserable for many people.
It will more than likely effect the quality of Life you will be living during the treatments.
The healing process slows with age.
But it also depends on you specifically.
How well do you heal from other ailments or injuries?
Do you find yourself suffering from many conditions or ailments?
How much medication do you take and what are their effects on your system?