f98d2e05_Privacy_and_Cookies_Policy__When_does_it_expire_
[Cookie] YouTube [Cookie name(s)] SID, LOGIN_INFO, use_hotbox, PREF, SSID, HSID, watched_video_id_list, __utma, __utmz, demographics, VISITOR_INFO1_LIVE [Data stored] Various unique identifiers, as well as login information that may relate to a Google account. [Description] Google set a number of cookies on any page that includes a YouTube video. While we have no control over the cookies set by Google, they appear to include a mixture of pieces of information to measure the number and behaviour of YouTube users, including information that links your visits to our website with your Google account if you are signed in to one. In doing so, information about your use of our website, including your IP address, may be transmitted to Google and stored on servers in the United States This cookie does not identify you personally unless you are logged into Google, in which case it is linked to your Google account. Google's Privacy Policy Opt out of Google Analytics [When does it expire?] 
Most of the cookies expire 10 years after your last visit to a page containing a YouTube video, although some expire sooner.
Privacy and Cookies Policy
When does it expire?