Not being a doctor I can't tell you if its anything to worry about but I can tell you that my father, who is 80, suffers from numbness in the feet. It's a function of peripheral neuropathy - a fairly common condition as people age. Often when nerve problems occurs as we age they show up in the feet first. Certainly if its something that continues you should tell your doctor about it. Good luck!
I have the same feeling of spongy feet and no doctor seems to have heard of it. I am glad others have it in that perhaps there will be some understanding of what we go through and perhaps even a treatment. Does anyone else suffer from this. It is getting worse for me.
My father (86) suffers these syptoms too. Did you find out any more information on effective treatment since posting this item?