Hi there

Even if you purchased your TV 2015, the model is still a 2014 model.  However to answer your question, it matters not.  Only Sony's Android based TVs are capable of YouView.  They keyword is Android.

Also please see point number 5 in the general FAQ, which im slowing putting together:

https://community.sony.co.uk/t5/android-tv/faq-s-on-this-forum/td-p/2333989

Cheers