"but the experience is meaningless"
Taking that approach, almost all experiences are 'meaningless' in the context of "i need someone to do these exact steps XYZ". But, as someone who was programming (hobby) in the 80s, I think there's some value here (and of course I don't think it's purely defensive and me-focused, but maybe it is).
You mentioned elsewhere "Drop the me of 30 years ago into the technology environment of today and I would be completely lost." Perhaps, but many people today are completely lost too. The "you" of 30 years ago had characteristics - curiosity, problem-solving, etc - that informed the experiences. Over time, perseverance was demonstrated with an accumulation of related experiences.
The specific experiences of programming in 1985 are not relevant to most problems of today, but a demonstrated history of successful logical thinking applied to a variety of computers/data/projects is not irrelevant nor meaningless.
EDIT: Rereading the second half of your post, I agree with you on the second half - drop hobbies, drop older tech references, etc - lose the extraneous stuff in general from general purpose resumes. Lose date references in general, I think (graduation dates, etc). Focus on things that are relevant to modern work practices/tools.
Perhaps you were meaning all that older stuff is meaningless in terms of a resume? I agree. It's the sort of stuff that might come out in an interview or two, depending on who you're talking with. Telling a 24 year old about doing C64 assembly programming does no good, and wastes time - that is essentially meaningless in terms of general tech job hunting. There are rooms for these nuggets, but you need to be selective.