As far as I know there's no way to merge two accounts. The other account (dutchy100169) is just a plain forum account, with no link to any hosting, so what you could do is just set a dummy email on that, through the forums, and then change the one on this account (debo) through the control panel for the account (not in the forums). That way the contact email for the hosting would also become correct.
As for the time limit, we'd only look at how long ago the hosting account was created, not how long the "client account" has been around. That said the hosting account was actually created in 2013 so you definitely qualify on that part.
Seeing as part of your site consists of an image gallery you need to carefully take into consideration this part of the ToS that deals with that type of usage:
ToS said:
Personal Image and Video Galleries
Personal galleries are limited to 500MB of disk space for images and videos.
I have upgraded your account to unmetered. Just make sure you stay within ToS going forward.