PIP: Population aging, changes in the proportion of old to young people, and the mechanisms of these changes were studied in Egypt between 1917 and 1960. Between 1917 and 1947 the proportion of young children remained the same; by 1960 it had increased by 4%. The percent of old people decreased from 5% to 3% in 1917 to 1947. It was concluded that there was no clear trend for the aging of the population in Egypt during the study period. Possible future trends are evaluated, and the predictions vary with the assumptions made about the population. Decling fertility was predicted to cause larger changes in age composition than the effects of declining mortality.