Hi Walter, thanks for your input! I see now that the way I phrased that last paragraph gives off a wrong impression. I wasn't suggesting that I've gained some perfect wisdom, intelligence or anything of that sort, I know how ignorant and foolish I am. I'm just assuming (and yes, this is wrong in the strict sense) that people are largely already developed by their mid twenties let's say and change very little from that point onwards. This is a simplification of course, as exposure to new experiences and ideas does change people, but that's just my model for the universe, I have to work with the available data and resources after all, and previous experience is what we all base our knowledge upon.
Now when chronic fatigue and lack of motivation to do anything to improve are among one's ailments, my "past predicts future" model becomes a bit more accurate. Because unlike positive experiences that are generally short-lived in nature and eventually disappear on their own, negative experiences and states of mind often require informed active participation in order to change. I'm neither informed nor do I have the energy required to fix myself.
We never stop learning of course and you're most likely a lot wiser and a lot more educated now than 40 years ago, but even amidst all that change you're still suicidal, and that's what I imagine would be the case for me as well. How much has your experience during those 40 years altered your perception of your own life, of yourself and your subjective experience? That's what matters ultimately.