The only active pitcher with 3,000 IP (less than half of Young's career total) is Bartolo Colon, who is only technically active. Verlander is 12 IP away and Greinke is 93 IP away. Both are likely to eclipse that total next season.
Many historians believe Young did throw in excess of 100mph, but I don't think this has ever been validated. Clearly he was a bit of a freak, however, as he did probably throw a lot harder than many of his counterparts. Of course, velocity might not have been as important to their success, as they were legally allowed to throw spitballs..