To dream that you became young again, means that you are longing for the old days. It could also show that you are regretting the things that happened in the past. To see your children being young, means that you are worrying about them too much and wish to protect because of some matter. For parents it is a very common dream, especially if the children are already adults.
Young dream meaning
Read more about dreaming of Young in other dream meanings interpretations.