Will old flats always have a crack and holes problem

I'm currently filling a lot of cracks and holes in my very old flat. Once I'm done I'm hoping I won't have to be doing any more filling.

As I have a lot of sensitivities I've been advised to move to a new build flat which tend to have less problems. Someone advised me that I'm going to continue to have problems whilst I stay in older buildings. However once Im done filling and sealing I dont expect there will be any more issues.

Is there anything about an old flat that predisposes it to develop more cracks and holes such that after I finish my work, more issues will arise?

Thanks.