An aging face in a dream often reflects an awareness of time passing -- a quiet confrontation with mortality or a shifting self-image you haven't fully come to terms with. Seeing yourself much older can point to anxiety about what you haven't yet done, more than fear of age itself.
He that asserts things that can never be proved by experience is deceived and ambitious, but thus it always happens, those that are most ignorant of Art delights to boast of doing things different or wonderful. - Cardan Girolamo (1501-1576)