I was much older than most when I got into Metal, I'd say about 15 or 16. What about yourself?
Thanks for asking. I'm going to tell you about when I got into the black side of metal.
Firstly, my favourite Darkthrone is 'Transilvanian Hunger' closely followed by 'A Blaze...' and 'Under...' as well as 'Panzerfaust'. 'Goatlord' and 'Soulside...' are pretty cool but not quite the same magic for me. After 'Panzerfaust' my interest dwindles a little bit to the point of disappearing completely over the last decade or so.
I initially got into black metal back in 1995 when I was 15, so generally same age as you. It was just amazing - so mysterious, because we obviously had really limited information about it all, mostly from magazines of course. The whole Euronymous thing had just gone down, and we were all pretty impressed with it all in a juvenile teenage boy sense. My first black metal album was Satyricon's 'The Shadowthrone' in 1995, and to this day it remains my favourite. By the way, I still remember my friend and I being appalled by the sound quality of Darkthrone when we first listened to it in a music store in about 1995. The covers were amazing but it took a bit of time to get used to that sound hahahaha.
In 2000 I got a re-energising for black metal when 'Grand Declaration of War' came out. Mayhem toured Australia the next year I think and did an instore, and it all took off again for me. I moderated the forums at blackmetal.co.uk from about 2003 to technically now, although I haven't been to the site since about 2012 and I think it's closed down. It used to be really good though, with a pretty small idiot to legend quotient considering the types black metal seems to draw.
These days I still love the genre as my favourite in metal, but 99% of new releases I just ignore. There's just so much copy-cat stuff and I don't really care much for the avante-garde soundscapes and off-kilter shit that seems to be all the rage these days. Hail 1990-1995. Hail Euronymous. 666 etc lol.