Woman have always been in search of the fountain of youth and the key to a wrinkle-free, eternally youthful glow.



One woman now says she has cracked the code by never cracking a smile.



In fact, she's remained stone-faced for 40 years and swears it's why her skin is so smooth.



The now 50-year-old nicknamed Mona Lisa has resisted the urge to grin and giggle since she was 10 years old - not at parties, not even at the birth of her daughter.



She says her poker face is why she doesn't have a single line of expression and some some experts believe it might actually work!



On the flip side, 70-year-old Christyne Remnant says she hasn't stopped smiling since she was 8 years old.



Remnant says that an ear-to-ear grin helps prevent wrinkles on her forehead.

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