i've had stretch marks on my back and thighs for around 3 years now due to rapid growth, ive never done anything to get rid of the marks, and because i didnt feel the need to do so, i waitied for them to fade away. now, the ones on my thighs are almost gone, but the ones on my lower back are clearly visible, anyone know if these creams still work if i apply them 3 years later than normal?