The document discusses demographic transition theory and Saudi Arabia's current and future stages of transition. It outlines 5 stages of demographic transition, from high birth and death rates to low birth and death rates. Saudi Arabia is currently in stage 2, with transitional birth and declining death rates. By 2050, the document predicts Saudi Arabia will reach stage 5, with low and stable population growth and an aging population over 65 years old increasing from 5% to 25% of the total population. This will impact healthcare costs and education expenditures as the youth dependency ratio declines.