Well, if your problem is that you can't access the e-mail, I am not sure. If you do recall the e-mail, though, the usual procedure is to e-mail the developer and require the account info -- it can take a while, but you will most likely regain the account info. However, the account info will be sent to the e-mail ; if you can't access that e-mail, then it might be a bit of a trouble to get the info back. But knowing the e-mail is already a great deal, since you can at least ask your account info back.
In that case, I'm not sure of what to do -- You know the e-mail, which means you could theorically get the info back; but since you don't have access to the e-mail, it's odd. Best case, you could possibly ask the info back and explain your situation, receiving the info in a different e-mail. But I'm really not sure in that case; it may or may not be possible. Can't help you any further than that.
Edit: Dunno about inactivity, but my bet is that most likely not -- I have taken long periods of inactivity and have not been deleted.