I agree with your point Applespider.

I would give my seat to a lady carrying a young child but not if the child is still in the buggy.

I would also like to ask why mothers do not ask their older children to give their seats up to those whose need is greater.

I have often given up my seat despite being one of the older passengers and having medical problems to older passengers when children between 5 and say 12 are sitting down.
I well remember my mother insisting I stood up to let any adult sit down.