Growing old in moments is read as awareness of time passing faster than you would like. Tradition also links it to a sudden weight of responsibility, or to wisdom arriving all at once.
When this appeared in your dream, what were you feeling?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.