{
 "approved_by_author": "\u231b",
 "citation": "Horvath, S. DNA methylation age of human tissues and cell types. Genome Biology 14, R115 (2013).",
 "citations": 7625,
 "citations_date": "2026-10-02",
 "clock_name": "horvath2013",
 "data_type": "DNA methylation",
 "doi": "https://doi.org/10.1186/gb-2013-14-10-r115",
 "journal": "Genome Biology",
 "last_author": "Steve Horvath",
 "model_type": "elastic net regression",
 "n_features": 353,
 "notes": "Pan-tissue DNAm-age predictor fitted by elastic net to a transformed chronological-age outcome and returned to the year scale; it uses 353 CpGs shared between the 27K and 450K arrays.",
 "platform": [
  "Illumina 27K",
  "Illumina 450K"
 ],
 "population": "all ages",
 "postprocess": "anti_log_linear",
 "predicts": [
  "chronological age"
 ],
 "reference_values": true,
 "research_only": null,
 "species": "Homo sapiens",
 "tissue": [
  "multi-tissue"
 ],
 "training_target": [
  "chronological age"
 ],
 "unit": [
  "years"
 ],
 "version": "0.5.7",
 "year": 2013
}