Some frozen Mammoths found are up to 45,000 years old

"The absolute age in years of the frozen carcasses was for a long time a subject of speculation. During recent years, with the availability of Carbon 14 dating, the exact age of many of them has become known, with surprising results. Their ages fall into two main groups, one ranging in age from 45,000 years to 30,000 years and a smaller number of remains from 14-11,000 years old.
end partial quote from:
end quote from:

Woolly Mammoths: Evidence of Catastrophe?