Do I have a receding hairline ?

[garthtrickett]

So I got a real nappy haircut which resulted in me shaving my head for the first time in 3-4 years and I have noticed I have that "M" shape going on. I've always had super thick hair and when I was 18 i had a similar shaped hairline (my mates use to call me thunderbird). I've attached some pictures what do you guys think ? is it mature hairline or a receding one ?