the ova is retro and the manga up to before 2000 is retro.

Huh, the OVA is older than I remember it being. I thought it was mid 90s or even later. People also seem to forget that the second part of the OVA (that adapted the first half of part 3) started releasing in 2000. So if you want to be a stickler you can only talk about half of the OVA adaptation.

Never really liked Jojo. Always found it a bit dull.