For many years the tour kept track of the oldest and youngest finishers, but not every year.
I had recently heard that 12-years old was the record for the youngest rider. Published articles show that Alfie Roberts (12) set the record in 1981 (Times-Standard, May 18, 1981, page 11), followed by Ian Kramer (9) in 1982 (Times-Standard, May 19, 1982, Page 12).
Is age 9 the record or was this a typo in the paper? Has anyone tied or broken this record in recent years? If you know please contact me or add a comment in this blog post below.
On a separate note, Andy Shaffer broke 6-hours at age 15 (5:53) and in 1983 was second to Jim Allen in 5:29 at age 16. Now those are impressive times for a teenager!
UPDATE: Yes, Ian Kramer is the youngest finisher at age 9. For more information see the comments below.
DISCLAIMER: I published this information for curiosities sake. This is a record I would rather not see broken.