Most MEDCs are experiencing slow rates of population growth and some are experiencing population decline.
Most MEDCs are in stage 4 of the demographic transition model - the population is high, but not growing. Some countries have a declining population and could be said to be entering stage 5. This means that the birth rate in their country has fallen below the death rate. Most MEDCs have a very low rate of natural increase.
The average life expectancy in MEDCs is rising. This is due to:
Birth rates in MEDCs are falling as people choose to have smaller families later in life. Contraception is easily available and well understood.