How can we test for balance of an individual. All of the balance test I see in the internet is for the geriatric population. How can we test for the general balance of an individual? Is there any assessment tool for that test?

Age makes little difference for a test, they routinely test younger people for balance if they suspect a possible tumor or stroke. Older people having balance issues are more fall prone. Google" Balance Teats" for a number of sample tests.