The original "magic user" class has been broken into so many categories over the years, that I guess I wizards is a bookish caster. I draw inspiration from many sources.
For an example of a younger, physically fit wizard, Harry Dresden comes to mind.
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Yeah, not D&D IP, but he is certainly what I picture most adventuring wizards to look like.
Fom the real world...
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Michael Scot
Famous Chinese Wizard:
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Xu Fu. This dude's life reads like a D&D campaign. Court sorcerer, alchemist, and explorer tasked by the Emperor of China to find the Elixir of Life.
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The Witch of Endor. Consulted by Saul (in contradiction against his own laws against sorcery) to contact the soul of Samuel for guidance in preparation of Israels battle against the Philistines.
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Mother Shipton fits right in as a D&D Wizard. Living from 1488 to 1681. Mainly known for prophecy for there are stories of her turning people to stone and other magic.
And let's now forget our modern wizards. ;-)
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en.wikipedia.org
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Alan Moore looks more like a D&D wizard than the D&D art.