If you go to the website of the Taylor-Schechter Unit in Cambridge University Library, where about 140,000 manuscript fragments from the Genizah of the Ben Ezra Synagogue in Cairo are housed, you will find a wealth of good images of the targums. Go to the manuscript search facility and check the 'Klein' box, name your biblical book and away you go. This site is a very well-hidden treasure.
Information provided does not deal directly with the date of manuscripts and this is also not provided in the hard copies of the published catalogues. The scholars working on this project have elected to record the more objective types of information over speculative estimates of age.