What's biting you all today? We often have queries of this kind and discuss them politely, so why these rather odd comments to a poster who is worried about a friend?
Emigrating is a big step at any age, but presumably the people concerned in this case have thought things through before moving to Spain "to try it out".
Why assume that this lady and her husband don't already speak German?
If they want permanent residency in Austria, they will have to learn the language if they cannot already speak it, so language will not remain a problem, as the German tutition for foreigners in Austria is very good.
Emigrating at any age involves finding out about pensions and health care, surely?
Considering how often gransnetters mention the high prices of care homes in the UK, they are not likely to be higher in Austria.
What would concern me more is the fact that these people apparently have two adult children and are contemplating settling with or very near to the one of these. Bit of a slap in the face for the daughter in this case, I would think.
OP you can point out the things that concern you for your friends: pensions, health care, residency permits, language, but that is really all you can do. We can and should admre their courage.
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