A disclaimer: OKCupid's data pool, which is based on its users, isn't a representative sample of the population. A survey of 23,000 people in Germany found that 23-year-olds were particularly satisfied with their lives, "all things considered". Your muscles are at their strongest when you're 25, although for the next 10 or 15 years they stay almost as hefty - and this is one of the traits that can be most easily improved, thanks to resistance exercise. The 37 percent Rule of statistics says that at age 26 you'll have met enough people to have some solid options without waiting so long that they start pairing off without you.
Women's salaries peak at about 39, and men's at about 48.
Sure, your salary will hopefully keep rising to account for inflation, but will you actually be able to buy more with it as you age?
Many of the points mark the middle of an age range that scientists have identified, which means they are all determined by averages.
Some are also surveys, not controlled trials, so there is a possibility the self-reports don't capture the most accurate picture.
But nine years after your peak ability to remember names, you may need to ask them to reintroduce themselves anyway.
Nobel Prize winners make their big discovery at 40, on average.
You're best at learning new faces when you're about 32.
People's ability to quickly and accurately recognise faces of strangers being shown to them a second time in a lab test peaked at about 32.
On average, 18-year-olds fare best on the task, according to a study published in 2016.
The ability to remember unfamiliar names peaks at about 22.
But in many cases, the numbers keep cropping up for a reason, which is that life isn't a downhill slide from youth. Learning a second language is easiest when you're about 7 or 8.