Your Cambridge English exam result and certificate are valid indefinitely. They show that on a particular date you demonstrated language skills at a specified level *.
Individual institutions (such as universities, employers, professional organisations and government bodies) can choose how long to accept results for. Some institutions will only accept certificates taken within the last 2 or 3 years, although many will take into account evidence that you have taken action to maintain or improve your level of English since taking your exam. Please speak to the institution that you wish to apply to if you have any doubts.
Applications for a visa to study or live in a country may also require that you hold an English qualification that was taken within a specified period (within the last two years for example). We strongly advise that you check the regulations for that country carefully before making an application.
* Note that in the case of IELTS, we recommend that institutions should not accept a result which is more than two years old as proof of current language ability, unless accompanied by evidence that English language skills have been actively maintained or improved since taking the test.
BULATS - we recommend that employers/educational institutions ask for some further proof of a candidate's level of English if the test was taken more than two years previously. Please note that BULATS was discontinued at the end of 2019.