You have exausted the civil records archive. You have, through acts of deaths, marriages, etc, reached approximate birth dates for ancestors in the early - mid 18th century.
If you want to proceed further backwards in time, there are still three great resources, but for the great majority without indexes: catasto onciario (in archives, mostly in Naples and municipalities), parish books of deaths, baptisms and weddings (mostly in parish churches, some in central church archives) and notary acts (in state archives).
Notary acts are usually the last step, since searching through them is very slow. For most of these the keepers of the resources (archives, municipalities, parishes) must be contacted to check the existence of records and obtain permission to make research. This means patience is ABSOLUTELY NECESSARY.
Research in the Catasto Onciario (1742 - 1755) in Abruzzo
>Check if it is available in the archives
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[A new window will open, when you have checked close it and you'll be back here] L'Aquila
The Onciario is a great resource, since a kind of "census" was requested, listing all the possessions to be taxed but also, what is most interesting for the genealogist, the composition of all the families, with names and ages of all the members.