Why there is no chart by age
The document that governs most US treatment decisions, the 2018 AHA/ACC Multisociety Guideline on the Management of Blood Cholesterol, sets an LDL cholesterol risk-discussion band of 70 to 189 mg/dL for adults 40 to 75, and inside that band the decision is keyed to your calculated 10-year ASCVD risk, not to which decade you are in. Which number counts as a treatment goal for you depends on your risk category, not on a lab's reference interval. Two people age 52 with the same LDL can land on opposite sides of a treatment decision because their calculated risk differs.
That is the honest answer to "what should my cholesterol be at my age": there is no guideline lookup table for it. What follows is the closest honest substitute, the actual published categories, with who each one applies to and the document it comes from.
LDL cholesterol: the categories and the decision thresholds
Most lab reports still print the 2001 NCEP Adult Treatment Panel III (ATP III) categories below. They are not sex-specific: each row applies to "adults," not to men or women separately.
| Category | LDL-C |
|---|---|
| Optimal | Under 100 mg/dL |
| Near optimal / above optimal | 100 to 129 mg/dL |
| Borderline high | 130 to 159 mg/dL |
| High | 160 to 189 mg/dL |
| Very high | 190 mg/dL and above |
The 2018 AHA/ACC guideline does not use those bands to decide treatment. It uses thresholds, and this is where the one age boundary that sets a treatment threshold actually sits:
| Population | What it means | LDL-C |
|---|---|---|
| Adults, any age | Severe primary hypercholesterolemia: high-intensity statin, no risk score needed | 190 mg/dL and above |
| Adults 40 to 75, primary prevention | Risk-discussion band; statin decision by 10-year ASCVD risk | 70 to 189 mg/dL |
| Very high-risk ASCVD, already on a statin | Threshold to consider adding ezetimibe, then a PCSK9 inhibitor | 70 mg/dL and above |
HDL cholesterol: where men and women actually differ
This is the one place these guidelines genuinely split a number by sex. ATP III's own low and high bands are not sex-specific, but the AHA/NHLBI metabolic syndrome criterion, used in the 2018 AHA/ACC guideline's list of risk-enhancing factors, sets a different cutoff for men and women because women's HDL-C runs higher on average, so the same absolute number signals more risk in a woman.
| Population | Category | HDL-C |
|---|---|---|
| Adults (ATP III) | Low, a major risk factor | Under 40 mg/dL |
| Adults (ATP III) | High, a negative risk factor | 60 mg/dL and above |
| Men (metabolic syndrome criterion) | Reduced HDL-C | Under 40 mg/dL |
| Women (metabolic syndrome criterion) | Reduced HDL-C | Under 50 mg/dL |
Drug trials that raised HDL-C did not reduce heart attacks, so no guideline sets a target to raise it with medication. Full detail is on the HDL cholesterol reference page.
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Total cholesterol: the one number with a real age split
Total cholesterol is the sum of LDL, HDL and the triglyceride carriers, which is why it mixes a risk-raising signal with a risk-lowering one. MedlinePlus (NIH National Library of Medicine) lists one age split, and it is childhood versus adult, not decade by decade.
| Population | Healthy level |
|---|---|
| Adults 20 and older | Under 200 mg/dL |
| Age 19 and younger | Under 170 mg/dL |
Two people with the identical total can carry very different risk depending on the split between LDL and HDL. No guideline sets treatment decisions on the total alone. The actionable numbers are on the LDL and HDL reference pages, and the full detail on total cholesterol is on its own reference page.
Triglycerides
| Population | Category | Triglycerides |
|---|---|---|
| Adults, fasting (ATP III) | Normal | Under 150 mg/dL |
| Adults, fasting (ATP III) | Borderline high | 150 to 199 mg/dL |
| Adults, fasting (ATP III) | High | 200 to 499 mg/dL |
| Adults, fasting (ATP III) | Very high | 500 mg/dL and above |
| Adults, fasting (AHA 2011) | Optimal, a metabolic-health marker, not a treatment target | Under 100 mg/dL |
| Adults, primary prevention (2018 AHA/ACC) | Risk-enhancing factor: persistently elevated (ideally 3 measurements) | 175 mg/dL and above |
None of these rows differ by sex or by age band either; they apply to adults generally. Very high triglycerides (500 mg/dL and above) carry pancreatitis risk and are managed as a separate, urgent problem. Full detail is on the triglycerides reference page.
What age actually changes
Age is not irrelevant, it just does not set a target number by itself. Three genuine age markers exist in this guidance: the 2018 AHA/ACC guideline suggests risk assessment starting at age 20, with lipids checked every 4 to 6 years in adults free of disease; the primary-prevention risk-discussion band runs from 40 to 75; and the USPSTF ties statin-use decisions to adults 40 to 75 with risk factors. None of those is a target LDL, HDL or triglyceride value for a given decade of life, they are ages at which screening starts or a risk conversation applies.
Frequently asked questions
What is a normal cholesterol level by age?
No major cholesterol guideline sets targets by age. NCEP ATP III's optimal LDL (under 100 mg/dL), the 2018 AHA/ACC guideline's high-intensity-statin threshold (190 mg/dL and above) and the 2019 ESC/EAS very-high-risk goal (under 55 mg/dL) all apply by risk category and clinical situation, not by decade of life. The only age boundary that sets a treatment threshold is the 2018 AHA/ACC guideline's 40-to-75 risk-discussion band; total cholesterol's separate age split (below) is not a treatment threshold.
Is a different cholesterol level normal for men and women?
For LDL, total cholesterol and triglycerides, the sourced categories are the same for men and women; each is listed as applying to adults generally. HDL is the exception: the AHA/NHLBI metabolic syndrome criterion sets reduced HDL at under 40 mg/dL for men and under 50 mg/dL for women.
What cholesterol number requires a statin, regardless of age?
An LDL of 190 mg/dL or higher meets the 2018 AHA/ACC threshold for high-intensity statin therapy without a risk calculation, at any adult age.
Why does total cholesterol have an age cutoff, if the others do not?
MedlinePlus (NIH) lists a healthy total cholesterol as under 200 mg/dL for adults 20 and older, and under 170 mg/dL for those 19 and younger. That is a childhood-versus-adult split, not a decade-by-decade chart, and no other lipid number in this guidance carries an age split at all.
When to talk with a clinician
Before starting or stopping a statin, and before treating any single lipid number in isolation. A 10-year ASCVD risk estimate is the number the primary-prevention statin decision actually hangs on for adults 40 to 75, and a clinician is the one who can calculate it with you.
