Including 18 year olds as children is a bit odd. I wonder what portion they are.

wow. Using your source of https://cdan.dot.gov/query

40%(4/10) on 2020-10-31, 50%(1/2) on 2019-10-31 were 18.

21%(39/186) of the total from 2006 to 2020 halloweens.

Did you intentionally do that to inflate the numbers by including legal adults in your definition of children? Why?