Unfortunately no...most of the older ships are 30-40 years old. It is possible the source of the error is not what I think it is...I was told that it was caused by the fact the ships all have a tracked deployment time (even though they are not parasites). The oldest ship, the Upholder, has been scrapped, the next oldest should be the Protecteur...most of the rest of them are from 2270 or later and I am currently scrapping and rebuilding those. I will look in more detail as the grav survey ships may be closer to 50 years old but there can't be 18 ships that old.
It isn't really game destroying but it does get annoying when I have to click "ok" 10+ times to advance the turn and then wait a minute or so for things to finish.
Added in Edit:
The oldest ship still in service (date is Feb, 2300) was built in 2241. There are 4-5 ships from the mid 2250s. After that 4-5 ships from the 2260s. The rest of the ships come from 2270 or later.