Why doesn't Mario look like he used to?

Over the last 40 years, Mario's design has changed a lot! In Donkey Kong, Mario looked like some kind of strange, middle aged man who HATED gorillas; now he's much younger and friendly looking. So, why has his character design changed so much? Let's find out, as we answer the question: Why doesn't Mario looks like he used to?

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SOURCES
Donkey Kong Development
https://www.nintendo.co.uk/Iwata-Asks...
https://www.gameinformer.com/b/featur...
https://edition.cnn.com/2007/WORLD/as...
http://content.usatoday.com/communiti...
  / 1   (scanned by The Gaming Historian)
Donkey Kong USA Art
http://www.boxequalsart.com/donkeykon...
Mario Segale Image
https://www.technologizer.com/2010/04...
Super Mario Bros
https://www.nintendo.co.uk/Iwata-Asks...
Yoichi Kotabe
https://www.nintendo.co.uk/Iwata-Asks...
  / 1  
Mario 64
   • Yoshiaki Koizumi @ Montreal Internati...  
https://www.gamedeveloper.com/pc/migs... (write up of above video)

CREDITS
   • Arcade Longplay [500] Mario Bros.   (Footage of Mario Bros)