To dream of becoming young again, means an anticipation of happiness, of joy, and of recovering property.
Dream dictionary: Regenerate dream meanings
In the case of modeling clay, it indicates that we will create excellent projects and we will reach triumph. If it is very liquid mud, the one that makes you filth, it portends fall into immorality; although it is always possible to regenerate.
Gorge symbolizes the innermost part of our subconscious, because it corresponds to those impulses that seized us and wraps us unexpectedly and that we find overwhelming and burdensome. If the gorge shows a channel of water inside, it means that recognizing these forces and impulses will help us to regenerate and purify ourselves.