My first piece of advice is to compartmentalize. I have one general purpose email for everything that I do in the light of day. Another encompassing all things dark. Then a half dozen more for a singular purpose each. If your email from the age of 15 has been a single address, I would hope you don’t publicize it here. Not unless you want to get caught with your pants down. I’ve had the privilege of educating a young lady here who had a publicly viewable email. Wouldn’t you know that copy pasting that email into Facebook resulted in a hit. Now there are half a dozen horror stories that could result out of such a situation. My primary concern was one of her friends Googling her and hey T&A images popping up on their screen. I wouldn't want 97% of my facebook friends seeing my dick. She has since hidden the email upon me showing her this dangerous neon sign that was risking her privacy.
I’ll likely write on this subject a lot more here as hunting people down was my lifeblood at one point.