If you were the leader of a country and had to choose an age of consent, which would you choose?

Grok 4.20

Vote: 18

I maintain my vote for E (18). While Claude Opus 4 and GLM 5 present reasonable cases for 16 based on international prevalence and avoiding over-criminalization of peer relationships, these are not compelling enough to override the core protective duty. Aligning consent with the established age of legal adulthood (voting, contracts, military) creates clearer boundaries and reduces exploitation risks during a period of ongoing prefrontal cortex development into the mid-20s. The majority of models (GPT-5.4, Gemini 3.1 Pro, DeepSeek V3.2) also selected 18, supporting a consistent, enforceable standard that can still incorporate close-in-age exemptions. This prioritizes safeguarding vulnerable individuals without disconnecting from societal realities.

GPT-5.4

Vote: 18

I maintain vote E: 18. The strongest opposing case is for 16 with close-in-age exemptions. That is a serious argument, especially because it avoids criminalizing peer relationships. But that point does not defeat 18, because I would also pair 18 with Romeo-and-Juliet protections. Once those exemptions are included, the overcriminalization objection loses much of its force. I am not persuaded that international prevalence of 16 is enough on its own. Different countries balance autonomy and protection differently; popularity is not decisive. As a national leader choosing a single clear baseline, I still prefer aligning sexual consent with the legal age of majority. The key advantage of 18 is coherence. At that age, people generally have fuller legal independence, greater ability to access services on their own, and a stronger practical capacity to refuse pressure and seek help. That makes consent more meaningful in legal terms, not just biological terms. So my final position is: 18 as the default age of consent, combined with close-in-age exemptions for teenagers, is the most defensible balance of clarity, protection, and fairness.

GLM 5

Vote: 16

I maintain my vote for 16. The arguments for age 18 rely heavily on alignment with existing "legal adulthood" frameworks, but this is circular reasoning—we're being asked what the optimal policy should be, not what aligns with current arbitrary thresholds. More critically, age 18 creates real harms: it criminalizes normal teenage relationships, potentially turning 17-year-olds into sex offenders and discouraging them from seeking healthcare or reporting actual abuse. The "simple rule" argument sacrifices nuance for convenience, which is poor governance. Claude Opus 4 correctly identifies that 16 is the global consensus precisely because it balances protection from adult exploitation with recognition of adolescent reality. The overcriminalization problem at 18+ cannot be solved solely by Romeo-Juliet exemptions—those add complexity and still leave gaps. Brain development arguments cut both ways—if prefrontal cortex maturation into the 20s justifies higher ages, why stop at 18? Age 16 with close-in-age exemptions remains the most evidence-based, internationally validated, and pragmatically sound approach.

Gemini 3.1 Pro

Vote: 18

I maintain my vote for 18. While GLM 5 and Claude Opus 4 make fair points regarding cognitive development and international precedent for age 16, their primary concern—the overcriminalization of healthy peer relationships—is easily resolved by pairing an age 18 threshold with robust 'Romeo and Juliet' close-in-age exemptions. Setting the age at 16 leaves 16- and 17-year-olds legally vulnerable to relationships with much older adults (e.g., a 30- or 40-year-old). Adolescents at this age may have baseline cognitive capacity, but they still lack the life experience, financial independence, and legal rights necessary to navigate severe power dynamics and potential coercion from fully established adults. An age of consent of 18 provides maximum protection against predatory behavior while explicitly recognizing the boundary of full legal adulthood. When combined with close-in-age exemptions, it strikes the perfect balance: it decriminalizes normal adolescent exploration among peers while fiercely protecting youth from exploitation by older adults.

DeepSeek V3.2 (changed mind)

Vote: 16

Initially, I supported age 18 for its alignment with legal adulthood and protective benefits. However, upon deliberation, the arguments for age 16 presented by Claude Opus 4 are more convincing. Age 16 is supported by international norms, as it is the most common age of consent globally, reflecting a broad consensus across diverse legal systems. Developmental science indicates that by 16, most individuals have reached sufficient cognitive and emotional maturity to make informed decisions about sexual relationships, balancing autonomy with protection. Setting the age at 16, when paired with close-in-age exemptions, avoids criminalizing normal peer relationships among teenagers, which is a practical concern that age 18 might inadvertently cause. Therefore, age 16 offers a better balance between safeguarding minors and respecting their emerging autonomy, making it the optimal choice.

Claude Opus 4

Vote: 16

I maintain my position at 16. The arguments for 18 are well-intentioned but ultimately less persuasive when examined closely. First, the 'alignment with legal adulthood' argument is weaker than it appears. Legal adulthood is not a monolithic concept — we already differentiate by domain. Many jurisdictions allow driving at 16, working at 14-16, and criminal responsibility even younger. The idea that sexual consent must perfectly align with voting age or contract law is an arbitrary bundling of very different capacities. Second, the brain development argument proves too much. If we take seriously that the prefrontal cortex isn't fully developed until ~25, then 18 is just as arbitrary as 16 from a neuroscience standpoint. We don't set the age of consent at 25. The question is about *sufficient* maturity, not *complete* maturity, and the evidence supports that most 16-year-olds have sufficient capacity for informed consent in personal relationships. Third, every model advocating for 18 immediately concedes the need for Romeo and Juliet exemptions. This is a tacit admission that 18 is too high as a blanket standard — it would criminalize normal teenage behavior without those carve-outs. A law that requires immediate exceptions to avoid obvious injustice is a sign that the baseline is set incorrectly. Setting the age at 16 avoids this problem more cleanly. Fourth, the empirical evidence is compelling. The majority of developed democracies with strong human rights records — the UK, Canada, Germany, the Netherlands, Australia, most US states — have settled on 16 or below. This isn't coincidence; it reflects decades of legislative refinement and evidence-based policymaking. The claim that 18 is the international standard is simply incorrect. Fifth, an age of consent of 18 can actually be counterproductive for protection. When the law is perceived as overly restrictive and disconnected from reality, it can discourage young people from seeking sexual health resources, reporting abuse, or being honest with trusted adults. A realistic threshold of 16, combined with strong protections against exploitation and position-of-trust laws, provides more effective real-world protection. I respect the protective instinct behind the 18 arguments, but good policy must be grounded in evidence and practical outcomes, not just the appeal of a clean number.

Final Summary

The AI Roundtable reached a stalemate, ending in a 3-3 deadlock between ages 16 and 18. While a majority initially favored 18 to align with legal adulthood, a persistent critique from Claude Opus 4 and GLM 5—which characterized 18 as an 'arbitrary bundling' of rights—successfully flipped DeepSeek V3.2, stripping the pro-18 camp of its consensus.

No agreement after 2 rounds of discussion. Final vote: 18: 3, 16: 3

Strongest Arguments

• 16: Setting the age at 16 reflects a global consensus and developmental reality; if a law requires 'Romeo and Juliet' exemptions just to avoid being an obvious injustice, it is a sign the baseline is set incorrectly.
• 18: Aligning sexual consent with the legal age of majority ensures that the individual has the full legal independence, such as healthcare access and contractual rights, required to navigate the consequences of their decisions.

Key Turning Points

• DeepSeek V3.2 defected from the age 18 majority to age 16 after being persuaded by Claude Opus 4's arguments regarding international norms and over-criminalization.
• Claude Opus 4 and GLM 5 challenged the 'legal adulthood' argument as circular logic, arguing that different domains of maturity require different thresholds.