The destruction also is a process of becoming newer and fresher. Otherwise, you would have always been a baby, and would never have become an adult. Every seven years, they say, the whole biological process of a person changes. You become a new man every seven years. Your biological evolution is an indication of what is happening in the whole cosmos.
Cells dying, and changing, is part of the natural anabolic and catabolic process in things.
It takes place simultaneously. The world is moving forward and it has to move onward. Though there appears sometimes to be a retrogression, ultimately it is a progression.