Cosmopolitan villages or suburban/city outskirts with a range of ages?

Without living in the centre of a city - can anyone recommend places with a good mix of nationalities and ages? Ie not just Britsand not entirely retired.  :-) We dont have kids with us any more but neither are we retired yet. We want to live somewhere open (not hugely built up and on top of each other), green and leafy with a cultured, lively yet relaxed community.  Thoughts?  :-)

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