12. Lifespan
The lifespan of each species of dinosaur are unknown, but scientists speculate that creatures like the T. Rex were fully mature at the age of 28, but could have lived much longer if given the chance. Some estimate that long-necks like the sauropods listed above could have easily lived to be over 100. One thing is for sure, the lifespan of any dinosaur, and animal for that matter, depended on the abundance of food and the amount of danger encountered.