The article discusses how 75% of the time spent with children is spent by the time they are 12 years old, due to significant developmental changes that occur around this age. The author argues that the often-quoted 18 summers with children is an overestimation, and that parents should make the most of the time they have with their kids before they become more independent. The article also highlights the importance of spending time in nature with children to create lasting memories. The author encourages parents to have goals and a bucket list to make the most of the time they have with their kids.