Hi everyone. Most of the time I lurk and don't post, but I have strong feelings about this one.
I love tattoos and have several, including a nearly quarter sleeve on my shoulder. My husband has a few, as do many of our friends. I'm an academic librarian, and while it's an open-minded profession, my tattoos can be covered easily by most work attire if the need arises.
One way to think about tattoos done in the past is as a timeline of your life. You can look at each one and remember what you were passionate about at the time you got it. That way it's not necessary to regret them, because they represent the path you've taken (like wrinkles in a way).
Finally, my opinion about having tattoos in Japan. I lived there for a year (pre-tattoos) but am by no means an expert, so I welcome hearing what others say. However, while tattoos are still somewhat taboo for Japanese people (as Angie said), I get the impression that it's not such a big deal for westerners in Japan to have them. My husband had one when we lived there in 2009. It didn't show in his work attire, but he went to plenty of public baths and it never caused any problems.
I realize this didn't answer your question about tattoos being "fashionable"...But I think they are so highly personal that whether or not your choice is fashionable takes a backseat to your feelings about it.