Age Number of patient Rate (%) < 10 01 2.5 10 - 18 35 87.5 >18 4 10.0 Age Oldest: 21 Youngest: 08 Total 40 100% The oldest patient is 21 years old and the youngest is 8 years old, of which the age of 10 - 18 years accounts for 85%, there are 4 patients older than 18 years old.