There are numerous studies confirming the effect you're speaking of, altough I'm not sure if dating apps have an influence on that. It was shown that certain n

There are numerous studies confirming the effect you're speaking of, altough I'm not sure if dating apps have an influence on that. It was shown that certain national ice hockey teams were comprised mainly of players who were born at the beginning of the year. It is theorized that this is because the date that cuts one class for another is at the beginning of the year. If you're born in January, and you start playing hockey at 5, you're gonna be significantly older than a child that's born in december. As a result, you'll be recognized and helped more by your coach, which improves your chances of becoming better, and drags into adulthood, up until you're in the national team. The same applies for academic and professional careers and I'm sure dating as sell.