Perhaps not a comic, but I thought it was relevant: The "average" american life in weeks:
The article,
Your Life in Weeks is good in general, and makes a good point that each week is for living.
This particular breakdown reminds me of the text from
How much of your life are you selling off?: "I pictured the typical career-fueled life as settling out into three distinct phases: pre-work, work, and post-work...For most people, the post-work phase marks the first time they can do what they like with their days without the approval of a parent or an employer. The post-work phase is typically shorter than the work phase. If average life span is a little shy of 80, the typical post-work phase is less than twenty years, and by the time it begins, the worker’s body can’t do what it used to do."