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She will have to apply for a spouses visa once you are married.
You will have to show:-
You will need to apply for settlement (ie. spouses visa) by using VAF4 Settlement, available for download from UKBA's website. It would be best for either a solicitor in the UK to prepare it in consultation with both you and your wife before submitting it.
I'm afraid that she will have to pass an English language test, she should contact the nearest embassy to find out about local test providers. The test comprises of very basic everyday phrases, spoken and listening english.
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Though the UKBA website seems to suggest that is is now required, I believe that if you submit your application before the date then it will not be required.
The age difference does not matter particularly.