What is the average erect penis size for men in their 20s?

Checked on September 20, 2025
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1. Summary of the results

The average erect penis size for men in their 20s is a topic of interest, and various studies have been conducted to determine this average. According to [1], the pooled mean erect penis length is 13.84 cm (≈5.45 in) from 56,669 men across 33 studies, which can be used as a reference for men in their 20s [1]. Similarly, [2] reports a pooled mean erect length of 13.93 cm (≈5.48 in) with a 95 % CI of 13.20–14.65 cm from 55,761 men, which also supplies a contemporary global average applicable to that age range [2]. Additionally, [3] cites a 2020 review stating the average erect penis length is between 5.1 in and 5.5 in (≈13–14 cm), which aligns with the figures from the peer‑reviewed meta‑analyses and can be used as an approximate average for men in their 20s [3]. [4] provides measurements for healthy Turkish men aged 19–30, with a mean age of 20.3, and found that the stretched length—considered an approximation of erect length—averaged 13.7 cm, offering a relevant estimate for men in their 20s [4].

2. Missing context/alternative viewpoints

A key point to consider is that most of the studies analyzed do not provide specific data for men in their 20s, but rather offer a general average that can be applied to this age group [1] [2] [5] [6]. [7] does not provide any information on the average erect penis size for men in their 20s [7]. Furthermore, [8] found that stretched penile length has a non-significant correlation with age, but does not provide specific information on the average erect penis size for men in their 20s [8]. It is essential to consider the age range and sample size of each study to accurately determine the average erect penis size for men in their 20s. The benefits of considering these factors would be to healthcare professionals, who can use this information to advise patients, and to individuals who are concerned about their penis size.

3. Potential misinformation/bias in the original statement

The original statement asks for the average erect penis size for men in their 20s, but does not provide any context or age-specific data [1] [2] [3]. The analyses provided do not show any intentional bias, but rather a lack of specific data for the 20-year-old age group [5] [6] [1]. However, [7] does not provide any relevant information, which could be seen as a lack of transparency [7]. The benefits of this framing would be to researchers who are looking for a general average, but not to individuals who are seeking specific information about their age group. Health organizations may also benefit from this framing, as it provides a general average that can be used for educational purposes.

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