Backlink blasting aged domains

Ive got several aged domains that are just sitting around and was wondering since they have been indexed in Google for years is it worth backlink blasting them and targeting a decent long tail?

Pardon if my terminology is not accurate I am quite new to BHW.

Well if you have not been backlinking them you need to start slowly and build up backlink velocity. You throw 5000 backlinks at them when they have been getting zero you will not help rankings at all.