You see, it was quite fashionable for men to grow long hair on the back of their head back then in 1980s, 1990s, especially among singers and actors. I was watching an old show of David Copperfield conjuring up a trick and his hairstyle drew my attention.
I've searched to find what it's called in English, but I couldn't find a clue. I tried semi-finish hair, back hair, but it was useless. Please see this link which helps you to find out exactly what I'm looking for. How do you describe it in English? Something like
This man has a long back hair.