Why are there more younger people now than ever that love old movies so much?

because the population of the United States increased just over 38% from 1984 to 2018

What movies are being made today that are actually movies? Very few...

It's mostly series and franchises... Very few actual standalone movies... At it's most basic, this shows you that the past has a type of storytelling and an aesthetic that is simply very rare today...

Young people in the past went to the movie theatre and every week they'd have a few options of actual movies to watch of varying quality, some good, some bad and many in between... Young people today can go to the theatre for weeks and months without being able to see an actual movie...

It's rare... there are a few made every year that make the habit worth while for those who seek it, but they tend to be limited in release compared to the bug franchise series and tend to be crammed into a short period, once or twice a year during particular festivals or oscar season...

So a young person today, who is into movies will seek out older movies fromthe 100 years of cinema history that is easily accesible now...

I think young people today can be surprisingly sophisticated about certain things they're interested in. They have access to more information than anyone ever has so they aren't limited to the current box office like older people were. It makes me happy to know they're watching the classics and they value those "old" movies.

What an odd proposition. Why are there more younger people now than ever that love old movies so much?
Is this even true? If so, I'd love to meet them, but sadly, I doubt this will be reciprocated.
"And by old movies, I'm talking about films made in the before the 1990's."
Disregarding the mangled sentence structure ("in the before the 1990's" ?), is this what qualifies as old these days?
I'm sure many fine films have been made post-1990, but I'm at a loss why this would be a year of demarcation.
I suppose anything that was created before you were born by definition seems old.
But a thoughtful person knows this isn't so.

I grew up watching 80s horror and even now it's all i enjoy watching,I think movies from that decade are very entertaining,movies this day and age just copy one another.

Good question ... maybe they are young enough to be naturally repulsed by the pile of dung that modern movies have become because they are not brainwashed yet by newer hyped movies? Of course, maybe it is also something about the older movies that have survived are much better than average - they just tried harder and did not care so much about maximizing profit as opposed to just making a good movie,

Or it could just be that earlier movies outnumber later movies by many multiples, i.e. there are more of them.

While the question that the original poster asks is overly simplistic and not particularly well-formed, here's my take on the subject:

As many have already pointed out, the sheer amount of pre-1990 movies outnumbers the quantity released afterward. Thanks in part to the ubiquity of the internet, film knowledge, analysis and discussion is much more pervasive than in previous generations. Sites like this provide movie lovers young and old a platform to share their recommendations and discover new titles at the same time. Additionally, the level of access to films far surpasses previous decades, with home video and streaming services providing film fanatics with a lifetime of viewing options. I would also argue that, as far as mainstream theatrical releases are concerned, we're seeing fewer and fewer new releases per year, thus limiting the options for those perhaps seeking more challenging, thought-provoking fare or maybe just films that match their individual tastes cultivated by years of viewing habits.

In short, the trend of younger people displaying appreciation for "older" films stems from a myriad of circumstances. Ultimately, though, what's wrong with people liking what they like?