Thoughts so far....
Spoiler
"Any man" could be a common name, like Joe. "Out of their prime" implies fat, unfit or old (I don't get a "not yet in their prime" vibe). "Accepting a lack of energy" definitely means subtracting an "e" from something (chemical equation symbol for energy). "Which saturates their being" probably refers to the E or E's that appear in or throughout the resulting name/word (and must be subtracted). The most literal phrase to be saturated is "their being" itself, which gives us "thirbing", but that doesn't seem to be on the right track. So... Joe + old - e = joold

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