#!/bin/bash

while [[ true ]]
do
    echo "enter your name:"
    read name
    if [[ -z $name  ]]
    then
        echo "bye"
        break
    fi
    echo "enter your age:"
    read age
    if [[ $age -eq 0 ]]
    then
        echo "bye"
        break
    elif [[ $age -le 16 ]]
    then
        echo "$name, your group is child"
    elif [[ $age -ge 17 && $age -le 25 ]]
    then
        echo "$name, your group is youth"
    elif [[ $age -gt 25 ]]
    then
        echo "$name, your group is youth"
    fi
done