For me since i was 8 years old when Burton's first Batman movie came out, but before that i was more into other DC heroes like Superman, Swamp Thing, The Flash, Justice League, Aquaman and others including Watchmen. I was never into Batman cause he had no powers and he wasn't a monster either but thanks to watching 89's movie in theaters 7 times i became a fan of him as i learned you don't need cool powers or be a monster to be a superhero.
I had 89's merchandise from action figures with vehicles, backpack, lunchbox, movie magazine which i still own in mint condition, the comic adaptation, novel, t-shirts, CD soundtracks with both Prince and Elfman which i still own, cards (which i own in a album), mug, posters, watch, coloring books, Taco Bell cups and all that sort of thing. Ate the cereal as i had the bank too, got the movie on video with the NES game for christmas, collected the comics since especially Catwoman ones as i had a crush on her and taped/watched the 60's show religiously.
I even saw Batman Returns 6 times in theaters when i was 11 and loved it, i had the merchandise, still own the CD, cards which i have in an album as well, comic adaptation, movie magazine. Ate the cereal, had the VHS with SNES/NES games for christmas and taped/watched TAS religiously.
Nolan sure impressed the hell out of me with his brilliant reboot series.