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When we had wooden double glazed window frames installed 30 years ago i bought a wood preservative made by Dulux (i think) and painted it on the frames prior to the glazed panels being fitted, paying particular attention to the rebates, so they have lasted 30 years without going rotten. But they still need painting! On the other hand the UPVC windows fitted 35 years ago have not needed painting and are probably more thermally efficient. I should point out that we have a mixture of wood and UPVC. If i replaced the wooden ones it would be with UPVC. Assuming that there are no restrictions on the materials that you can use on a house of that age. Hope this helps.
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