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SOME 10 YEARS ago, before YouTube launched in 2006, women had limited options when it came to learning how to apply makeup. They could look at magazines’ beauty pages, or subject themselves to a makeup-counter makeover; perhaps ask a know-it-all sister how to wield a sable blush brush. “I just started experimenting when I was about 15,” said Karen Kelsky, 53, the founder and president of The Professor Is In, a career development service based in Eugene, Ore. But for the past two years, Ms. Kelsky has found it “challenging to figure out what products work for middle-aged skin.” Testing them was costly, ineffective and…