I am no super model and I have well pasted my 30s unlike some of the models on the NuFace website. The improvement in my skin I found to be slow and gradual. I would definitely take a photo at the start which is what NuFace recommend. I bought it for my jowl area, which has changed but it is not as obvious as my eye and neck, biggest change which I am thrilled with as my eyes were getting very hooded.
I would definitely recommend this product for improvement of facial tone. I feel if you started using NuFace in your 40s you would probably get better results but like most of us we leave things to the last minute, most noticeable.
Using NuFace take before photos so you can track the change