Most JW's now in the religion werent there when 1975 was a thing.
Are you joking? My sister was born that year, I was born in 1976. My mother's entire family is still in. You think her generation wasn't worried about her having children during the end times? You think that didn't have an impact on them then, and then impact their understandings that they taught their children? Please.
The generational teaching are ridiculous but they aren't completely wrong either. Every generation impacts the next generation. And if you think that no one pays any attention because it was 45 years ago..you're wrong. My generation are the parents now and I can guarantee you that they remember their parents being either freaked out or confused. I have peers that are still in who were very much impacted by that belief. Give it more time before no one remembers.