NIH MeSH · D017668Health Care
Age of Onset
Also known asOnset Age · Age-at-Onset · Age at Onset
Definition
The age, developmental stage, or period of life at which a disease or the initial symptoms or manifestations of a disease appear in an individual.
MeSH classification
- N05.715.350.075.100
- N06.850.490.250.100
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Common questions about Age of Onset
What does Age of Onset mean in medicine?
The age, developmental stage, or period of life at which a disease or the initial symptoms or manifestations of a disease appear in an individual. This definition is taken from the National Library of Medicine's MeSH (Medical Subject Headings) 2026 release, which is the standard vocabulary used to index PubMed and most medical literature.
Is Age of Onset known by any other names?
Yes. Age of Onset is also referred to as Onset Age, Age-at-Onset, Age at Onset in different clinical, research and patient-facing contexts. The MeSH descriptor groups all of these synonyms under a single canonical concept so research and records stay consistent.
Where does Age of Onset sit in the medical classification?
Age of Onset falls under the broader medical category "Health Care" in the MeSH hierarchy (tree numbers: N05.715.350.075.100, N06.850.490.250.100). Browsing the related concepts on this page takes you to neighbouring topics in the same branch of medicine.
Where can I get a plain-language explanation of Age of Onset?
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Source: NIH MeSH 2026 (D017668) — National Library of Medicine, public domain. View official MeSH record ↗