till what age do children need body massage   

There is no age limit when it comes to massaging a baby. You can massage your baby as long as you want. It is preferred to give your baby a good massage for the first year. As the baby grows older (s)he wouldn’t sit for so long and would want to keep moving and running around so it becomes tricky to massage older babies. If the baby likes and allows to get massaged you can massage him/her till it's comfortable for you and the baby.