I believe accounts are denoted as such if they date from day 1 and have never let their subscription lapse on their original account. So I imagine you'd already know if you were eligible for this.
It seems like I remember them providing stats several years ago (On Major Nelson's blog perhaps) and there was only an extremely tiny amount of continually subscribing customers from day 1 even then. I think they gave away a free XBLA game to those few customers.
Edit - Everyone got a free XBLA game for the 5 year anniversary and those from day 1 recieved 500 MS Points.
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