| Foetal | (FO) | 0-7 months in utero |
| Perinatal | (PE) | Birth ± 2 months |
| Infant | (IN) | 2 months–2 years |
| Child | (CH) | 2–6 years |
| Young juvenile | (YJ) | 6–12 years |
| Old juvenile | (OJ) | 12–18 years |
| Subadult | (SA) | 18–25 years |
| Young adult | (YA) | No/slight degenerative change (20-30 years) |
| Early middle aged | (EMA) | Slight/moderate degenerative change (30-40 years) |
| Middle age | (MA) | Moderate degenerative change (40-50 years) |
| Late middle age | (LMA) | Moderate/severe degenerative change (50-60 years) |
| Old age | (OA) | Severe degenerative change (60+ years) |
| Adult | (AD) | Dental/skeletal development complete. Insufficient information for closer assessment. |
| Immature | (IM) | Dental/skeletal development incomplete. Insufficient information for closer assessment. |
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