Is it possible to move to Cuba and live a normal life with all the
amenities that we have in the US (are there some people that live in
luxury in Cuba ) ?

Life is much better in Cuba ... NO George Bush.

http://www.guantanamo.com/

Why on earth would you want to live in a country with a communist
dictatorship?  You would be very restricted in what you could say. 
You would also be forbidden to worship as you please.  The country has
political prisoners.  Also, it is a very poor country.

If you want to retire to another country, why not pick another
Caribbean island country?  Or if Central America appeals to you, Costa
Rica is regarded as the most stable country in that region, and many
of the people there speak English as a second language.

Cuba is a nice country and it's sometimes much better to live in a
socialist state than living in a bullsht of Jungle Capitalism.Contact
with the Cuban Consulate to get information.
note, Cuba is a socialist state not a Comunist one.There are no states
goverments etc on a Comunist world.

You've asked 3 or 4 questions there. Whether it's possible for you -
presumably a US citizen and resident - to move to Cuba, the answer is
in practical terms "no", because of the embargo on travel to and
commercial dealings with Cuba. (Transferring capital and/or your
pension between the two countries would be among the major problems.)
Then there are the issues of whether the Cuban authorities would
accept you as an immigrant, and where you would live - remember it's
almost impossible for anyone to buy property there. As to whether you
could live a "normal" life with all US amenities, my brief experience
of life in Cuba would indicate that the answer to this is also in the
negative - lots of goods are simply not available. (But that does NOT
mean that Cubans themselves live an abnormal life: it's just that
what's normal for the US is not normal for Cuba.) And as to your last
question, I would hazard a guess that no-one in Cuba - up to and
including Fidel Castro - lives a life that is luxurious by US
standards, though as everywhere else in the world some people are
wealthier than others.

My two cents

If you live in the US

1. Sell all your possessions.

2. Open a Bank account in Canada

3. Transfer all your money to your Canadian Bank account

4  Go on your merry way to Cuba via the Bahamas (You can easily make 
   arrangements to have money withdrwn from your Canadian Bank account)

5. Plan never to return to the US (See question 211188 )

Yours Truly 

Mongolia

There are indeed other countries which would serve the same function,
but with more advantages than Cuba. You think you have anxieties here;
you don't even know what anxiety is until you spend time in Cuba,
jijiji. (That is Spanish for heeheehee, if you are going to Cuba might
as well start learning Spanish.

Mexico is one of the best places, since it is legal to move there, and
you can get most modern amenities that you would desire if you can pay
for them.  New cars (in Cuba, a 1955 Chevrolet is a new car); wide
screen TV's; high speed Internet; satellite TV with all the US
channels if you can pay for them.  Microwaves; frozen food though not
as wide a choice. Modern medical care if you can afford it, even
believe it nor not antibiotics, something worth its weight in gold or
platinum in beautiful downtown Habana.

Guadalajara is a good starting place, with nearby Ajijic for the
wealthy folks, and Chapala for a step down.

Frankly, most folks who move to another country are back within two
years.  So, don't burn your bridges behind you.

Also, I recommend getting a copy of the old book, WALKING ACROSS
AMERICAN by Peter Jenkins and think about it.

I am being a bit unfair, because I am trying to live fulltime in
Mexico, since I don't like how I am treated as a white male in the US,
and am only back because we come back every three months or so to
visit our kids all over the US.  Still, I am aware that most folks
simply can't handle a long term move to another country with a totally
different culture. For me it is tolerable, even wonderful, because we
live in the midst of my wife's large family. An uncle had 18 kids, and
the whole mountain side is her cousins and their offspring. To go by
yourself is almost unbearable in the long term, especially so if you
don't speak Spanish well, and are not willing to make personal friends
among the locals. Or, can't adapt to a totally alien culture.