I share the feeling. I too am in my mid-thirties, still know my ICQ number by heart (8 digits by the way), was on IRC and used Facebook in the early days. Nowadays I often wonder if my sentimental feeling about the social networks of yesterday is just a function of me getting old. The world changes. It is probably neither better nor worse. It’s just different.
I had a 6 digit ICQ number and I'm about the same age... someone deleted my account using my unlocked computer and I was never able to get it back...
Strikes me as insane that they'd allow account deletion without entering password for confirmation.
Also, what an asshole, whoever did that to you.