Retirement in Mauritius

You don't need a Mauritian passport per se but you would need to get the National Identity Card which wouldn't be a problem considering the year you were born in Mauritius.

Once you've got the ID card, you would be able to open a bank a/c, buy land/house and do other things which only citizens of the country can do.

Health care is free and senior citizens get free public transport as well. You would also be entitled to a pension irrespective of whether you have contributed to NI and you would be able to join local communities for old people where they organise trips to the beach, short holidays abroad and other fun activities.

However, I wouldn't recommend you coming back. I relocated to Mauritius from the UK and after 2 years, I've come back to the UK because there are too many problems in the country. Although health care is free, the service is incomparable to the NHS. Most mauritians lack courtesy, are self-centered and ill-mannered. The country has changed so much and it's no longer the same.

I've documented a lot of my experiences on this site and you can find some of the things I thought were wrong here, here and here. My advice to you is to weigh the pros and cons well before you make such a drastic move.