read iname
[ $iname ] || output;
if [ $iname -gt $SIZE ] || [ $iname -lt 1 ]; then
    echo "Choice is out of range"
    listname;
fi
idx=$(( $iname - 1 ))   # array index count from zero
nam=${NAMES[$idx]}
echo $nam

read -p "Enter $nam: " age
AGES[$nam]=$age         # update AGES array
echo "$nam=(${AGES[$nam]})"

1-Jack(12)    2-Kim(22)    3-Nick(89)    4-Sam(78)
5-Smith(7)

function listname {
num=0
for x in ${NAMES[*]};
do
    num=$(( $num + 1 ))
    printf "%d-%s(%s)" $num $x ${AGES[$x]}