I didn’t understand how to solve this question

Question

The question says: Write a program that takes the age of the user as
input, checks if the user is an adult, and outputs
to the console the corresponding boolean value.
Sample Input

function main() {
var age = parseInt(readLine(), 10)
// Your code here

}
But whoever is gonna help me , first thank you but I don’t need the answer I just need advice or website or an information that help me so I can solve it by my own .. and thank you