The 'absolute poverty line' is the threshold below which families or individuals are considered to be lacking the resources to meet the basic needs for healthy living; having insufficient income to provide the food, shelter and clothing needed to preserve health. Poverty among Americans between ages 18–64 has fallen only marginally since 1966, from 10.5% then to 10.1% today. Poverty has significantly fallen among Americans under 18 years old from 23% in 1964 down to less than 17%, although it has risen again to 20% in 2009.[10] The most dramatic decrease in poverty was among Americans over 65, which fell from 28.5% in 1966 to 10.1% today.