When my parents retired, many years ago, they started their search by going into the local library in each potential retirement area and checking what activities and societies there were locally. Several places high on their list were crossed off because how ever much local life there was, the activities available didn't interest them.
If Norfolk offers the life you want then checked on the availability of facilities, as Seacliff has pointed out, check the local hospital, also GP surgeries, easy access to shops and public transport, then check the property market. Is it an area with a good range of the kind properties you are looking for? If you want a bungalow in an area with few bungalows in the housing stock, this makes them unduly expensive. Only when you have g done your homework, should you make a final decision to move. Nowadays it is so much easier to check an area out with so much information available at the click of a mouse.
My parents original intention was to move to Kent, but they were finding diffficult to find anywhere there that met their criteria. They happened to visit a friend who had just moved to the West Sussex and liked the look of the place, did their homework, found it met their criteria and lived their for 35 years until they died. Because they had done their homework they rapidly built up a social circle of people who shared their interests and outlook and never regretted a very carefully researched decision. The shops were convenient, and the bus to the hospital ran past the end of the road.
Check Norfolk out, but do not be blinkered, lots of places one visits on holiday and like are very different if you live there. Keep an open mind.