I thought we talked about more in that way of categories - 29er - 26er - rigid - full-sun etc. Sometimes it's a bit carrots and knickers - you're comparing very different beasts. Some post '98 are still pretty retro - while some are more cutting edge.
This. I could enter my ‘98 Kilauea or Ku (which are more closer to the “official” retro category in spirit), or my 2018 Whyte T130 in the same month. Maybe the ‘98 on always needs to be a “special” month based on some category or other to focus the entries.