Like the title says, when I was younger getting near the end of the game felt like I was really far.
For example, in Jak and Daxter, when I got to the red sage hut when I was a kid, God Damn did I feel like I was really far away from the start of the game and have travelled a long journey.
Now when playing it, I still have fun, but I find the game is lacking it's adventurous feel to it what made me love it as a kid, even though I could never complete it.
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It's definitely just growing up... If you believe it is relevant to the chemical receptors in the brain that signal pleasure, notably cannabinoids, you can consume natural herbs which contain cannabinoids from your local... grocer?