Only if you actually apply for citizenship. I believe there's a way for foreign citizens (US? others?) to live there indefinitely w/o actually immigrating.

I don't know details, but I'm pretty sure that only applies if you're seeking citizenship. Also, at older ages, the amount of service you have to do goes down considerably.

OK, thanks for information to you and maxaf.

I only know one guy that went there a bit (academic) and he loved the place.