I think a birthday cracker of some sort is your best shot. You need to remember more than any sane person would remember to get back into an account using TNT's ticket system. When/if you do get back in, I suggest constantly keeping a record of any warnings, transfers, poundings or adoptions you make as well as other things and more screenies so that should you ever have any account issues again you can easily prove yourself as the owner of the account.
Your other issue is that if you haven't accessed your account in like three/four years, it will most likely be purged, ie, you can see the outside fine, but if you try to log in, it doesn't exist. Actually, you can check this without having the birthday. If you've already tried to log in and you have the proper password, you'll be taken to the birthday lock page, or you'll be taken to the account banned page.
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