I'm not happy about this, I've been using my email address for 15 years, and now I'm going to be receiving emails trying to scam me on a regular basis?

Not happy Mt. Gox
Just stick them in your spam folder and delete them, they will eventually stop. Doesnt really bother me, being a WoW player I get phishing emails all the time. You can always tell they are phishing emails, they usually come from illiterates who cant spell or use proper English. I have had my email for over 15 years also and have no plans on changing it now. I did see in another post they recommend you report the spam to spamcop.net