{"id":"GSX:POP-004:A01","local_id":"A01","name":"2025 starting population","statement":"The simulation starts with South Africa in 2025: 63.1 million people, of whom 6.6 million are aged 60 or older. Ageing is moved forward one year at a time to 2100.","value":"63.1","unit":"million people in 2025","type":"model assumption","provenance":"Manuscript calibration, using the cited Statistics South Africa 2025 estimate","evidence_strength":"sourced scale","sensitivity":"moderate","alternatives":["Renewal, baseline ageing, and accelerated-ageing fertility paths"],"href":"https://greyscienx.com/research/population-futures/the-politics-of-an-ageing-electorate/assumptions/A01"}