Nuclear disc normalised by bar length with respect to bar ages. We present the nuclear disc size normalised by the bar length (see Tables 1 and 3) for different bar ages. It is clear that the size relation between the nuclear disc and the bar does not depend on the bar age, with a constant value close to ∼12%. This demonstrates how the nuclear disc sizes depend on bar properties and resonances, and as the bar evolves, the nuclear disc's absolute size evolves as well.