Jennifer Lawrence received Best Actress Nominations at the age of 20 for Winter's Bone (2010) and again at age 22 for Silver Linings Playbook(2012) . Kate Winslet who received a nomination for Best Actress in a Supporting Role at age 20 for Sense and Sensibility (1995) and Best Actress in a Leading Role at age 22 for Titanic (1997).

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As best as I can tell age 22 is the youngest age to receive your second Academy Award nomination. Is there some way to verify?

I have no doubt that she is the youngest to receive two BEST ACTRESS nominations, as very young children are almost never nominated for BEST ACTRESS (this year is an exception as a 9 year old was nominated).

But there have been many nominees for BEST ACTRESS IN A SUPPORTING ROLE that were extremely young.