Many thanks for posting this!
The first thought that struck me was: 'Where the hell did all that time go? I honestly, yearn for my childhood, filled with beautifully carefree days. Welcome to the 'real world' Calvin! Sheesh! It sucks! You'll love it!'
Edited to add: As a Millennial who grew up on a more than healthy dose of Calvin and Hobbes comics, seeing Calvin in a suit and tie, was nothing short of a déjà vu moment. We have all 'grown up', as dictated by the cycle of life!