Claim: Lobsters are biologically immortal and don't age

First requested: July 11, 2026 at 12:03 PM
18%

IsItCap Score

Truth Potential Meter

Not Credible

AI consensusMedium

Grader consensus is moderate.
Range 10%–20% (spread Δ10).
The graders lean in the same direction but differ on strength. Skim the summary and sources.
Read analysis summary

OpenAI Grade

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20%

Perplexity Grade

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15%

Google Gemini Grade

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10%
Shareable summary
Verdict: Questionable
  • Natural History Museum confirms lobsters are bound to mortal existence, not immortal.
  • Older lobsters die more often at shell moults due to exhaustion, proving aging effects.
/r/fact-check-are-lobsters-biologically-immortal

Analysis Summary

The claim that lobsters are biologically immortal and don't age is false. Mainstream scientific sources, such as the Natural History Museum and UNSW Sydney, indicate that lobsters do not exhibit typical aging signs but are not immortal. They are more likely to die from factors like exhaustion during moulting. Alternative sources argue that lobsters possess telomerase, suggesting a form of biological immortality, but this is misleading as it does not equate to true immortality. Thus, the consensus among credible sources is that lobsters are not biologically immortal. All three graders point in the same direction, with minor differences. OpenAI comes in highest (20%), while Gemini is lowest (10%). Some sources claim lobsters are biologically immortal due to their ability to produce telomerase, which prevents typical aging. However, this does not mean they are immune to death; they can die from exhaustion or environmental factors. While these claims suggest a unique biological characteristic, they do not change the overall conclusion that lobsters are not immortal in the traditional sense. The evidence indicates that lobsters still face mortality risks, which undermines the assertion of true immortality.
Jump to source analysis

Source quality

Truth (from sources)2.00 / 10
Source reliability8.00 / 10
Source independence7.00 / 10

Claim checks

Fits established facts3.00 / 10
Logical consistency4.00 / 10
Expert consensus2.00 / 10
Related fact checks

Source Analysis

Common arguments
Supporting the claim
  • Lobsters have endless telomerase, preventing DNA shortening and normal aging.
  • No statistical link between age and survivability; 100-year lobsters match 20-year health.
  • They don't die of old age, only exhaustion from moulting or external causes.
Against the claim
  • Natural History Museum confirms lobsters are bound to mortal existence, not immortal.
  • Older lobsters die more often at shell moults due to exhaustion, proving aging effects.
  • Average lifespans are 31 years (males) and 54 years (females), not infinite.

Mainstream Sources

Publication

Natural History Museum

Title

Are lobsters immortal?

Summary

Lobsters are not biologically immortal and are bound to a mortal existence despite not showing typical signs of senescence.

Source details

Type: Official
Primary Data

URL

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Publication

Wikipedia

Title

Biological immortality

Summary

Lobsters are not immortal in the traditional sense because they are significantly more likely to die at a shell moult as they get older.

Source details

Type: Aggregator
Secondary Reporting

URL

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Publication

UNSW Sydney

Title

What lobsters can teach us about immortality

Summary

Lobsters do not die due to old age but instead die from exhaustion during moulting or from being caught by humans.

Source details

Type: Official
Published: 2022-09
Press Release

URL

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Alternative Sources

Publication

The Yale Herald

Title

The Eternal Life of Lobsters

Summary

Lobsters are indeed biologically immortal because they possess an endless supply of telomerase and do not experience normal aging.

Source details

Type: Blog
Published: 2021-04-01
Opinion

URL

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Publication

Broad Reach Canada

Title

Biological Immortality

Summary

Lobsters are in the grey area of being biologically immortal as they do not die of aging but eventually die from exhaustion or shell collapse.

Source details

Type: Blog
Secondary Reporting

URL

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Publication

Reddit

Title

Immortal Lobsters??

Summary

Lobsters seem to be functionally immortal with no statistical correlation between age and survivability.

Source details

Type: Forum
Low Evidence

URL

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Analysis Breakdown

True/False Spectrum (2.0)Source Credibility (8.0)Bias Assessment (7.0)Contextual Integrity (3.0)Content Coherence (4.0)Expert Consensus (2.0)43%

How to read the breakdown

Weakest areas
Truth2.0/10Consensus2.0/10
  • Truth: how well sources support the core claim.
  • Source reliability: whether the sources have a strong track record.
  • Independence: whether coverage looks one-sided or recycled.
  • Context: missing details (timeframe, definitions, scope) that change meaning.
  • Tip: if graders disagree, rely more on the summary + sources than the single number.

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Methodology