What kind of old account? If sythe, have you tried all your reset options, username, password, etc. If not, you can possibly contact an admin, but you aren't guaranteed anything.
Do you know the name of the account?
Email address linked to it?
I doubt your ip address is the same, but if you think it hasn't changed since you've last been active on the account, contact an admin to help you out.
Alternatively, you can post in Account Recovery with any information you think could link you to your old account.
Your best bet would be posting in the Account Recovery section, but you'll need to have a bunch of info regarding your old account. Without that, it's highly unlikely we'll be able to get you the account back.