I really enjoyed the book Four Thousand Weeks by Oliver Burkeman, the similarly-themed The Tail End post by Tim Urban, and the What Are You Doing With Your Life? video by Kurzgesagt.
Inspired by the Kurzgesagt Calendar Of Your Life poster I thought I'd try to make my own poster (WIP). In the meantime though here's an terrifying visualisation of how long you've got left (assuming you live till 80).