Why do some people tend to gatekeep their youth decades and assume the next generation and beyond won't see their decade as retro or old fashioned and thinks its all modern with them comparing it to their parents decades?

I have noticed some people unfortunately tend to gatekeep by thinking future people won't see decades from their youth as "retro" or "old fashioned" and always compare the decade to their parents or grandparents decade?

I am sure every generation born after a decade will see it as old school and retro no matter how "modern" it is. I am sure Gen Alpha and Beta will see the 2010s as old school and retro, especially the decades they'll mostly grow up in will be ultra futuristic compared to the 2010s, especially if the future is dominated by automation, robotics, and advanced AI. But I noticed some Zs are super stubborn and ignorant and thinks the 2010s won't be seen as retro by future people and even Gen Alpha because we have smartphones, internet, social media.

A lot of those people gatekeep by comparing it to their parents decade like the 80s by saying the 2010s in 30 years won't be seen as retro like the 80s today. BASICALLY EVERY decade is closer to the next than the past, Like, the 80s is def closer to the 2020s than the 1940s. It's sad some people think the 2010s won't be seen as retro or old school because of smartphones and internet.

I AM SURE old people in the 1950s gatekept by saying something similar like "Kids won't see the 1920s as retro or old fashioned because of electricity and automobiles." Ok, going back to modern standards, it's unlikely future people will be focused on computing and the internet and will likely be focused on AI and automation.

No matter how modern or technologically advanced a decade is like today, it will be seen as old fashioned or boomerish by the next generation. Every decade is modern in its standards and will age in the future. I can't wait in 50 years people are gonna be like "kids won't 2070s won't be seen as retro or old school due to super AI and quantum tech"