George Takei has mocked William Shatner’s trip to space. The former ‘Star Trek’ co-stars have been locked in a feud for decades and now the 84-year-old actor has branded the 90-year-old star an “unfit specimen” to have been chosen to be the oldest person to get to the edge of space when he blasted off with Jeff Bezos’ Blue Origin company earlier this week. George told the New York Post newspaper’s Page Six column: “He’s boldly going where other people have gone before. He’s a guinea pig, 90 years old and it’s important to find out what happens. “So 90 years old is going to show a great deal mo…