It'll be a contrast tbf given that the so-far confirmed run of Neil Young, Rod Stewart and Chic gives it an older feeling. But it was always going to be the case that it wasn't just going to be a festival bill full of names that could've done this festival in the late 70s.
Reading has always meant to be for the younger demographic though right? I went for a day trip there when I was 24 and felt old, which was a contrast to when I saw U2 at age 22 and felt like the youngest person in the entire O2 Arena.