A lot of the "troublesome youth these days" do shy away from older stuff, which is why I'm assuming you made the age restriction. The problem with that is, by giving such a plain cut rule, you never showed that you know why that is, and that's an important distinction.
When people leave older anime, it's typically for one of two reasons:
1) It is impossible to deny that older anime have a very different look and feel to modern stuff. The colors are more tired, the animation more bumpy and the story writing is more wild and exaggerated a lot of the time.
This is not always true however, especially in the last 5 years. The next biggest reason would be;
2) That people want the social element, something to talk about and keep up to date with. This is a fundamental problem with a continuing medium in that nothing you do, no matter what rules you create will solve.
The only solution is by somehow creating one go to pack that everyone can use togeth...wait a minute...
Why the lecture? Well, hopefully you'd be a little more open by only receiving titles that don't look or feel too old, as opposed to actual age. One of my favourite titles Nichijou ( https://kitsu.io/anime/nichijou ) is only just outside that 5 year rule, yet if you watched that and one of the less-popular shows currently airing, what you'd see would be a simple change in style, not genre or budget. It's also a good recommendation for starters (imo at least) as it introduces what anime can do that other mediums can't without being heavy or too "anime" to an outsider.
Alse, like, everyone is saying the same thing, so what I'm asking isn't for a defence on why we're pushing you (you got this your way man! I believe in you), but just for a reason. I'm baffled why anyone uses that limit...
Or, you could beat me to it and force me to edit this...that works too...
(if you made it this far than you already know i was too lazy to alter it :P)