The 2 Alpha Centauri 93A training ships (ex-Bolitic Helwin cruisers) are due to stay in service until 2120 but were already old when they entered DDS service (they may be the oldest warships in DDS service though the exact origins are still not sure). The DDS will give the 2 ships a major Tier 2 overhaul later this year which will likely be the final one before withdrawal.
The overhaul will include a full refit and replacement of worn parts. Navigational and communications systems will also be upgraded. The docking bay will also be reworked and enlarged so the ships can accept Coril shuttles more easily (at the moment it is a bit of a squeeze).