In this work, we study the long-term aging effect caused by Fe atoms in the superconductor CaLaBa{Cu 1−x Fe x } 3 O 7−δ with 0 ≤ x ≤ 0.07. XRD confirms that this system has a YBCO-like structure. The critical temperature (T c ) is strongly affected by aging and depends on the amount of Fe in the structure. Room temperature Mössbauer spectroscopy reveals the presence of the typical species A, B-B , C and new species E and F. Interestingly; A, which corresponds to the Fe 3+ atom located in the Cu(1) of the chains with spin S z = 3/2, shows a drastic reduction which means migration to the species B, B and C. Species B and B correspond to the Fe 3+ in the Cu(2) site forming planar quasi-octahedral and planar square pyramidal, while the C specie is a square pyramidal with O(5) respectively (spin S z = 3/2 in all these cases). Aging causes loss of superconductivity in the samples with 5 and 7% of iron content.