The 734s that BA have had since new were registered starting 17 years ago this week. Some of the 735s were built in 1990, as were some 733. G-LGTH/I are the oldest having been built in 1988. G-GFFE/I are the newest dating from 1995.
Most of Jet2's were built in 1986, with some in 1988 and are mostly ex Lufthansa and Ansett.