Humans lived past 800 years. I think Methuselah was 969 years old when he died.
I don't know if if it was during these life spans that dinosaurs lived along side man or not. But, dinosaurs definitely lived alongside of man.
"Just as it was in the days of Noah, so will it be in the days of the Son of Man. They were eating and drinking and marrying and being given in marriage, until the day when Noah entered the ark, and the flood came and destroyed them all." -Luke 17:26-27
With quotes like this form the Lord, I'm gonna go with it happened.