# Plasma THC Concentration Chart by Age Group

> **Author:** Benjamin Caplan, MD (ABFM Board Certified, MA Lic. #240562, NPI: 1962722637)
> **Publisher:** CED Clinic (https://cedclinic.com)
> **Canonical URL:** https://cedclinic.com/d34-png-plasma-thc-concentration-amoung-young-and-older-adults-after-using-cbd-thc-or-cbd-and-thc/
> **Published:** 2026-09-04T23:05:05-04:00 | **Last Modified / Clinically Audited:** 2026-09-13T14:37:39-04:00
> **Clinical Summary:** How plasma levels of THC and its metabolites differ between young and older adults after CBD, THC, or a combination, with summary notes.

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[← Back to the Technical Info Summary Hub](https://cedclinic.com/topic-technical-info/)Diagram & referenceA visual reference. The evidence, sources and clinical interpretation are in the linked article.About this diagramA grouped bar chart of plasma THC concentration, split into three blocks: CBD alone, THC alone, and THC plus CBD. Inside each block, four bars compare younger and older adults at baseline and at 60 minutes, with error bars on every bar and bracket marks flagging the comparisons the source figure called significant. Read across the three blocks to compare products, then read within one block to see how age and elapsed time change the bar height. The figure is reproduced as published, and the underlying values are not restated or recalculated here.The evidence behind it[Read the evidence: what controlled studies show about cannabis pharmacokinetics in older adults](https://cedclinic.com/cannabis-pharmacokinetics-in-older-adults/)That article carries the cited studies, the limits of the evidence, and the clinical interpretation.

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### Verification & Medical Governance

- **Lead Clinical Author:** Benjamin Caplan, MD
- **Credentials:** Board Certified in Family Medicine (ABFM), Founder & CMO CED Clinic & CED Foundation, Author of *The Doctor-Approved Cannabis Handbook* (Penguin Random House).
- **Clinical Scale:** 350,000+ lifetime evaluations overseen; 81,008-patient Real-World Evidence Registry (`~/.ced_rwe_vault.db`); 125,000+ peer-reviewed study literature observatory (`http://localhost:8768/api/explorer/terminal`).
- **License Verification:** Commonwealth of Massachusetts License #240562 (https://checkahealthlicense.mass.gov/).
- **NPI Registry:** 1962722637 (https://npiregistry.cms.hhs.gov/provider-view/1962722637).
- **Ethics & Data Privacy:** Clinical registry observations adhere strictly to HIPAA Safe Harbor de-identification (45 CFR § 164.514(b)) and criteria for secondary research exemption under 45 CFR § 46.104(d)(4).