French author/philosopher Michel Houellebecq dedicated a rather [unnecessarily] lengthy science fiction novel "The Possibility of an Island" https://en.wikipedia.org/wiki/The_Possibility_of_an_Island to this subject, with the grand idea being presented that out of all years humans mainly enjoy a tiny segment of it - when they're young, as it's defined by hormonal overabundance and "seeking oneself".
Older years are spaced out between dealing with problems of choices made in the past (e.g. being young and poor is not a 100% bad situation, being old and poor is rather depressing, as chances of a light at the end of the tunnel are somewhat bleak) and health issues. He dedicates somewhat lengthy paragraphs to the correlation between depression and [lack of] sexual desire/performance, reverting back to the idea that our internal state (happiness/depression) is nothing but a hormonal construct.
Older years are spaced out between dealing with problems of choices made in the past (e.g. being young and poor is not a 100% bad situation, being old and poor is rather depressing, as chances of a light at the end of the tunnel are somewhat bleak) and health issues. He dedicates somewhat lengthy paragraphs to the correlation between depression and [lack of] sexual desire/performance, reverting back to the idea that our internal state (happiness/depression) is nothing but a hormonal construct.