By Alex Lang New York (Knewz) — About 10 percent of older Americans have dementia, a new study found. While another 22 percent have mild cognitive impairment. The findings help shed light on the expanse of the problem facing the country as Americans grow older and live longer. Dementia can put a strain on families as they deal with the emotional toll andtry to find care for loved ones. This week, researchers at Columbia University released the study and found one in 10 people older than 65 have dementia. People with dementia are more likely to be older, less educated and be people of color, re…