A person can survive indefinitely if that person has sufficient food and water.
Most of the people who live in the Namib Desert live in isolated tribal communities who do not keep records of births and deaths. There is no way to answer your question.
The Namib Desert is a long, coastal desert that runs along Africa's southwest coast, from southern Angola through Namibia to the Olifants River in South Africa.Namibian Desert
With sufficient nutritious food and plenty of water, a person can survive indefinitely.
There is no Mambib Desert. There is, however, the Namib Desert located on the southwestern coast of Africa. It is a long, narrow stretch of cool coastal desert in Namibia.
A Long Time
With sufficient water and food a person could survive indefinitely. Without water, just 2-3 days in the summer months.
That would depend upon a number of factors. How serious is the person's illness? Does he have medical care? Does he have sufficient water and food and shelter? If the person does not have a life threatening illness and is living in a town or city in the desert with water and food, that person can survive indefinitely. Thousands upon thousands of people are in that situation everyday.
They can survive indefinitely as long as the food is nutritious and they have plenty of water.
Abyssinian cats are a domestic breed and would not survive for long in a desert.
Nearly all deserts (except Antactica) can have sandstorms that last for days. The Sahara and the Namib are especially prone to long lasting sandstorms.
Not for very long. People cannot survive for very long without water, anywhere.
Very hard. Without water, a person will not last long. It takes a specialized form of life to survive in the little/no water dessert. People can die in a desert very quickly without enough water to live.
The pet desert can survive without eating for a few months.