This study investigates the physical ageing of poly(L-lactic acid) (PLLA) and its composites incorporating lithium ferrite (LFO) particles (3. 5 wt%, 9.5 wt% and 19.5 wt%) after nearly a decade of storage. Time-induced changes in both the polymer matrix and composites were evaluated through a set of different experimental techniques. Differential Scanning Calorimetry (DSC) was employed to analyse thermal properties, complemented by thermal modulated DSC to inspect the structural relaxation in the glass transition region, which in neat PLLA occurs to a larger extent, due to a reduced crystallinity. Scanning Electron Microscopy (SEM) has shown morphological changes, however with no signs of deteriorated surfaces. Dynamical Mechanical Analysis (DMA) indicated an increased stiffness with the viscoelastic properties being dominated by the matrix due to poor polymer-filler interactions, as corroborated by Fourier Transform Infrared Spectroscopy (FTIR). In addition, Impedance Spectroscopy (IS) revealed an enhancement of the polymer chain dynamics in PLLA and an increase in conductivity for composites. The results suggest that long-time storage did not critically affect the performance of the materials, which in the case of LFO composites were even surpassed in terms of their electrical properties. These findings contribute to the understanding of the long-term stability of biopolymer composites for advanced applications.