Dennis Quaid got his birthday celebration started early with a serious check of the ole ticker involving his girlfriend ... and a roller coaster.
Dennis and model Santa Auzina -- who's 30, btw -- hit up Six Flags Magic Mountain over the weekend and strapped themselves in for high-speed fun, and a lot of screaming.
He'll turn 63 on Sunday.
If the ride doesn't make him feel young, something tells us Santa will.
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