Source: Immortality Begins at Forty
I discovered something a couple of years ago: Almost all culture, old or new, is designed for consumption by people under 40. People between 40 and Ω (an indeterminate number defined as “really, just way too old”), are primarily employed as meaning-makers for the under-40 set. This is because they are mostly good for nothing else, and on average not valuable enough themselves for society to invest meaning in.
you begin to experience immortality the first time you recognize the transience of experiences you thought were permanent, and more subtly, the permanence of experiences you hoped were transient.