From Longman Dictionary of Contemporary Englishwhat does it matter?what does it matter?spokenUNIMPORTANT used to say that something is not important It all happened so long ago now, what does it matter? What does it matter how old I am? → matter
Examples from the Corpus
what does it matter?• We'll do it tomorrow or the next day. What does it matter?• Well, what does it matter?• Hill people, valley people, what does it matter if gullibility remains unaffected by our environments?• The same as what does it matter whether or not I was a virgin when I met Gillian? 