Yes, stability decreases with age. I could go into more detail, but the short story is I am 73 and am noticing balance issues. My doctor did a couple of fast test (walking heel to toe, standing on one leg, etc.), and then sent me for a panel of blood tests. The blood tests did not show anything, so he referred me to a neurologist. He told me that this could be age related, but it was showing up sooner than one would expect. The referral hasn't happened yet, but if nothing else shows up at least I will have a baseline. In my case there was an previous event that " might" be a factor, to complicate things.
That you have noticed it is significant. Don't be mislead by an internet diagnosis, although hearing different possibilities is good. Speak to your doctor at your next physical. If he can't find anything wrong, both of you will have a baseline for the future.
The possible causes are varied, ranging from aging to an inner ear problem to a B12 deficiency, and much inbetween.
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