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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Maybe your tastes have changed as you've grown up? Pokemon felt such a long ass game now I can beat the story in 2-3 days. Victory Road in Sapphire is like 10 minutes long seriously.