If you tend to fret about how fleeting time is, you might not want to upset yourself with this video: Scientific studies have established the ages at which certain behaviors and characteristics reach their all-time high, a video on Business Insider shows. Although we’re guessing that most of our readers have passed the milestones when strength (25 years) and the ability to learn a new language (before puberty) are scientifically at their all-time high, we hope there are a few milestones you can still look forward to, such as the positivity of one’s self-image (past the age of 75 for both genders).