Consistency of self-reported age and gender on Reddit

Checks of self-reported age and gender in public Reddit posts and comments: 2,300,680 people who stated their age twice 1 to 8 years apart, 5,355,038 who stated their gender twice, share of women in 886 subreddits measured by two separate groups, and life-stage phrases by age and gender. Each check is compared with random pairs of people. This dataset accompanies the KissMyPost study Do Redditors lie about their age? We checked 2.3 million who said it twice. The method, charts and the full write-up are on that page. Files: reddit-self-report-consistency-checks.csv: All consistency checks. Each check, how many people it covers, the measured agreement and the random-pairs baseline. reddit-age-stated-twice-by-years-apart.csv: Age stated twice, by years apart. People, median change in stated age and share within a year, for gaps of 1 to 8 years. reddit-age-stated-twice-error-distribution.csv: Age stated twice: error distribution. Change in stated age minus the time that passed, real people vs random pairs. reddit-gender-two-methods-by-subreddit.csv: Share of women by subreddit, two separate groups. 886 safe-for-work subreddits: women among people who state their gender in text vs people who tag it in titles. reddit-life-stage-phrases-by-age.csv: Life-stage phrases by age and gender. People per 100,000 using grandkids, retirement, mortgage, homework, beard and makeup phrases, September 2025. reddit-age-lies-by-type.csv: Age lies by kind of subreddit. Share of age claims that are lies and the median age claimed vs usually stated: everyday, dating and three kinds of adult subreddit. reddit-age-lies-by-subreddit.csv: Subreddits with the most age lies. Everyday and adult subreddits: share of age claims that are lies and the median age claimed vs usually stated. Method: Self-statements of age and gender in public posts and comments, compared within each person, between separate groups of people and against phrases not used for labelling; random-pair baselines; known bots excluded. Measured: Change in stated age vs time passed; Agreement of repeated gender statements; Share of women by subreddit, two methods; Life-stage phrase rates by age and gender; Share of age claims that are lies, by subreddit. All files contain aggregates only, no individual posts or user names.