My daughter gets growing pains whenever she is going through a growth spurt. Start around age 3, she is 5 1/2 now and still gets them.
The thing that she found most comforting is when I would put my hands in warm water (or use message oil that warms/tingles that area) and message that area.
Also eat a banana... no joke, the potassium helps with growing pains. It does not help right away. I always make sure to include them more in my daughter's diet when she is going through a growth spurt and I have noticed the growing pains to be less painful.