Age (top) and metallicity (bottom) profiles of observed LSB dwarfs (coloured lines), compared to the average trends of quiescent cluster UDGs in the TNG50 simulations (dotted lines and dark grey shading) and field UDGs from NIHAO (dashed line and light grey shading). Solid lines show tidally stripped UDGs from TNG50. While observed age profiles are mostly flat, as in the simulations, the metallicity profiles show a divergence, particularly at larger radii.