Floor coverings and the floor/ceiling structure are critical elements in the transmission of noise, for sure, but so is the behaviour of the residents. Or to put it another way, your apartment with its creaky floor may not be suitable for “the normal sound of [two young children] walking, running occasionally and generally living their lives.”
In the old days a tribunal Member would tell the downstairs neighbour “suck it up – you chose to live in strata – apartments are noisy.” These days you are just as likely to get one who asks what you’re doing raising two kids in an older, noise-prone apartment and tell you to take whatever measures are necessary to cut down the noise.