History
How long ago did the dinosaurs go extinct?
66 million years ago
How long ago did the dinosaurs go extinct?
Non-avian dinosaurs went extinct approximately 66 million years ago following the Chicxulub asteroid impact. Modern humans have existed for about 300,000 years — meaning non-avian dinosaurs went extinct 220 times longer ago than our species has existed. Birds are technically living dinosaurs (Avian dinosaurs) and have existed for about 150 million years.
Source: Alvarez et al. (1980); geological consensus