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Searched the forum and it looks like this was last discussed in 9th.

Me and a mate are getting back into 40k after about... 15 years?

Using armies that have been buried in the shed that long.

All my power armoured csm are on 25mm bases. But i noticed current model kits and the 'world team championship' doc refers to 32mm.

Likewise my eldar all on 25 but new models seem to be 32 or 28.5??

Are there any mandatory requirements here? What about standard expectations for tournaments?
Thanks in advance

Thanks very much for the discussion everyone. I was actually asking in good faith, but the impression I get is that the best approach is just to bite the bullet and rebase.

We played a practice game and the gameplay impacts of smaller bases were pretty clear when a transport got blown up, and also when we had a couple of big melees.

I found the 'world team championship' doc I referred to earlier, and also
https://spikeybits.com/2023/12/warhammer-40k-base-size-reference-guide.html

So I guess if I just follow those?

The follow on question - are old models still legal? All my aspect warriors are old metal ones, and my Avatar in particular is the old metal one which I understand is like half the size of the current model.

Also, Havocs now apparently are a 40mm base size. Does that mean people never swap them back into normal csm legionary squads (32mm base) now?