As of the 2015 5-year ACS, the median income for a household in the county was $51,968, and the median income for a family was $61,809. Of full-time workers, males had a median income of $46,372 versus $39,690 for females. The per capita income for the county was $28,381. About 11.2% of families and 14.5% of the population were below the poverty line, including 19.9% of those under the age 18 and 12.6% of those aged 65 or over.

Based on the above article, answer a question. Which age group had the least people below the poverty line, under age 18 or 65 or over?
under the age 18