https://www.reddit.com/r/chrome_extensions/comments/q5cjpg/filter_out_videos_on_homepage/

filter_youtube.js

// ==UserScript==
// @name         Filter Youtube Homepage by Age
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  Remove Youtube videos from homepage that are over x years old
// @author       @Glench
// @match        https://www.youtube.com/
// @icon         https://www.google.com/s2/favicons?domain=youtube.com
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    var videos = document.querySelectorAll('ytd-rich-item-renderer');
    for (var i=0; i < videos.length; ++i) {
        var video = videos[i];
        var metaBlocks = video.querySelectorAll('span.ytd-video-meta-block');
        for (var j=0; j < metaBlocks.length; ++j) {
            var metaBlock = metaBlocks[j];
            var text = metaBlock.innerText;
            if (text.includes('year') && parseInt(text) > 2) {
                video.remove();
                break;
            }
        }
    }
})();