The vessels, found by archaeologists at Must Farm near Peterborough in 2011, have now been dated to about 1500 BC, 200 years older than was first thought.
Samples taken during the conservation process have revealed the boats to be made from oak, lime and field maple.
The vessels are undergoing a two-year preservation programme at Flag Fen.
The wooden craft are being sprayed with a special wax to stop the timbers from degrading, the same technique that was applied to the 16th Century Mary Rose warship.
It is hoped the process will reveal more about the Must Farm log boats, one of which is almost 30ft (9m) long.
Mark Knight, from Cambridge Archaeological Unit, said: "We've been carbon dating the sediment the boats were found in to try and create a detailed chronology of the river channel that once ran from the Midlands to the North Sea.
"This will tell us when each of the boats were disposed of by the people of the time.
"What we're now working on is carbon dating the actual boats which will give us an idea of when they were constructed.
"This will then tell us how long they were in use and gives us a much greater depth to the history of the area."
Visitors to Flag Fen will be able to watch conservators at work, with the aim of eventually putting the boats on public display in glass cabinets.
Mr Knight said: "As we lack any texts from the time to tell us what was going on, the boats help us to better understand the levels of craftsmanship and technical sophistication of the time.
"In the future we'll be judged by the technology we leave behind and these boats are a similar marker for the people of the Bronze Age."
See more on the boats of Must Farm on Inside Out East, Monday at 19:30 on BBC One and for seven days after on the iPlayer.

The long-term proposals for Hay Castle in Hay-on-Wye would allow it to open to the public for the first time.
Hay Castle Trust has been awarded £528,600 to help develop the plans which include an arts centre.
The castle was built in the late 12th Century by the powerful Norman Lord William de Braose.
It was sacked the following century and rebuilt by Henry III.
Castle House, the adjoining Jacobean mansion, was built in 1660 but was severely damaged by fire in 1939 and 1977.
The castle has been owned by Richard Booth, the man credited with transforming Hay into a global attraction for second-hand book lovers, but was purchased in 2011 by the Hay Castle Trust.
The Heritage Lottery Fund said the grant would help the trust to develop its plans.
It eventually hopes to secure more than £4.8m to put towards proposals which include conserving the medieval and Jacobean buildings, and creating a new centre for arts and culture.

The 26-year-old centre-back makes the move from Portuguese top-flight club subject to international clearance.
Igor Rossi told Hearts' website: "I am a leader, I play aggressively, with passion, and I like the ball at my feet to play from the back.
"From what I have seen, this is the Hearts way."
Igor Rossi spent four years in Portugal after moving from Brazilian club Internacional, where he was part of the side that won the 2010 Copa Libertadores.
But he only made two starts and two substitute appearances for their first team last season, while he made 10 appearances for Maritimo's second string in the Portuguese second tier.
Igor Rossi revealed that Hearts' director of football, Craig Levein, was pivotal in bringing him to Robbie Neilson's side.
"I had seen Scottish sides in Europe, particularly Celtic and the Scottish national side, and, when I was aware of Hearts' interest, I read up quite a bit about them and saw that they won the league by a huge margin over Rangers, so I was very impressed," he said.
"Robbie was very impressive and he explained to me his ambition for the club, where he expects us to be in the future and how he wants the team to play.
"Craig also spoke very well to me and I was immediately convinced that I should come to Edinburgh and play for the Hearts.
"I believe I will bring good experience from my five years playing in the Portuguese Division 1 and in the Europa League.
"I want to help the club challenge in every tournament we play in and I want to help my new team-mates.
"I'm also hoping to score some goals as I'm good in the air."
Eight Bronze Age boats discovered in a deep Cambridgeshire quarry are much older than it was first thought, carbon-dating research has revealed.
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A medieval castle which stands over a Powys town is to receive more than £500,000 as part of plans to restore it.
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Hearts have added to their defensive options with the signing of Igor Rossi Branco on a one-year deal after the Brazilian's exit from Maritimo.