This PDF file includes:

• table S1. Immature wild orangutan individuals examined in the current study.
  
• fig. S1. Barium distribution across two molars from an 8.5-year-old male Sumatran orangutan (ZSM 1981/246).
  
• fig. S2. Accentuated line ages in the first to third molars of an 8.8-year-old Sumatran orangutan (ZMB 83508).

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