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You may be able to solve the creakiness by just fixing them down more securely - if they're nailed down, maybe some of the nails have worked loose?
Gaps between boards, well you can get pine slivers or the draughtex stuff mentioned earlier although I haven't used either.
Not saying don't replace it but there may not be a need to write it off
rhowe-
@chrisbmx116 have used both slivers and a kind of sawdust mixed with glue. Neither great. Draughtext sounds interesting. To reiterate what @rhowe said, hammering boards down got rid of all our creaks when we sanded. There are a couple of looser ones a year on but easy to remedy. That said the biggest issue we have is that glue/sawdust mixture flaking up in lines between the boards - we have a dark stain on old pine boards so seeing the contrast annoys me no end.
In the next house it'll definitely be a project to get thick hardwood boards down in their natural colour. Ideally properly fitted/locking ones rather than literally lifting up the carpets and using the boards that were there, which is what we did. Found the pine ones to be too loud/flimsy/chippable. Would want some kind of sound proofing in the next house too (though appreciate this has limits).
I'd also consider a manufactured material I don't know the name of - my father in law has it in his kitchen - it must be some kind of polymer or something but it's hard as nails so doesn't scratch when you slide chairs over it but looks exactly like wood. Doesn't feel like it under foot but a relatively small price to pay to not have pockmarks all over the floor every time you sit in a chair.
CYOA
Flooring question folks... I assumed replacing floorboards in a house would be crazy money... but a quick google is telling me otherwise... anyone had it done? Small 2 bed flat - currently creaky old floor boards throughout with lots of shitty gaps. Would like non creaky and shitty.