Tim Tebow is beginning his professional baseball career at 29 years old, so the New York Mets can exercise only so much patience in seeing what they have. It's a baseball judgment they claim they'll make internally, with no preconceived notions and minimal regard for public perception. "I think this will run its natural course,'' general manager Sandy Alderson said on a conference call Thursday. "We're mindful of the fact that Tim is starting this endeavor at age 29, and there's a certain amount of realism we have to accept. But we're not really thinking about that. We're thinking about the beginning of journey and not the end.'' So here's where Tebow's baseball journey begins, with an understanding that no one really knows where it might lead: • Sept. 18: Tebow will report to the Mets' instructional league team in Port St. Lucie, Forida, where he'll take part in three weeks of baseball activities with much younger prospects who are also in the incipient phase of...