[hef19898]

Pensions and social security, as wrll as health insurance, have nothing to do with citizenship. The key is emoloyment (or voluntary contributions) when working in Germany. That applies to every EU citizen (usually no working visa required) and people working in Germany with working visas.

Obviously, it is more benfitial to gather pension in a high cost and salary country (e.g. Germany) and retire to a low cost country. No idea how UK pensions compare to German ones.

One health insurance benefit German citizenship gives you, is the option to keep German health insurance, also covering health care abroad, as an expat for up to 5 (?, might be ten) for close to nothing. For some funny reason doing so while based in the US is considerably more expensive than the rest of the world...

[mousetree]

This is true. I became a dual German citizen 15 years ago and paid no tax or social security contributions. I only started paying those once I moved to Germany and started working here a few years ago