Anything older than 1.5 to 2+ years old is going to be hard to mail. The bounce rate is going to be off the charts and emails will be expiring constantly keeping it high. Effectively there's much less active emails there and as such they're far less valuable.
Best thing to do really do is to start mailing actively on new addresses and slowly mix in things from older ones. I wouldn't even bother with things older than 2 years if you want to maintain some kind of IP reputation. It will junk IPs after a single mailer.
Not quite sure what your question is, the general answer is you need to start mailing them slowly. If they are truly emails you've gathered, you should have some information about where they signed up and what they were interested in, so target appropriately.
Also IIRC CAN SPAM states you can mail either those that opted in (prechecked or not) OR had purchased something from you within the last 18 months.
There's quite a lot to mailing and requires experience, it's not something that can be taught through a forum in a post.
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