The oldest DNA sequenced to date was collected on three molars belonging to 3 mammoths which lived some 1.25 to 2.08 million years ago. These molars were recovered in north eastern Siberia.

>DQ1888299.2 Mammuthus primigenius mitochondrion, complete genome
GTTAATGTAGCTTAAAACAAAAGCAAGGTACTGAAAATACCTAGACGAGTATATCCAACTCCATAAACAACAAAGGTTTGGTCCCGGCCTTCTTATTGGTTACTAGGAAACTTATACATGCAAGTATCCGCCCGCCAGTGAATACGCCTTCTAAATCATCACTGATCAAAGAGAGCTGGCATCAAGCACACACCCCAAGTGTAGCTCATGACGTCTCGCCTAGCCACACCCCCACGGGAAACAGCAGTAGTAAATATTTAGCAATTAACAAAAGTTAGAC...

_{Source: Million-year-old DNA sheds light on the genomic history of mammoths (2021)}