I think the point was that 20 somethings would be naive enough to think that everyone is as hip/informed as they are, and so the things ubiquitous to 20 somethings might be unheard of by us older crowd, and thus surprise them for our “being out of touch”.
Stephanie Germanotta was her name before the Lady Gaga persona. Youtube her performances, and you will see a reasonably talented musician and singer. She developed the Lady Gaga persona and became a pop icon, but the extremism that makes her such a hit overwhelms her musical talent with showy stylings and flashy clothes. She’s deliberately more about performance art than music. And autotune.
My stab at Knorf’s post as a 40 year old:
Gwen Stephanie [Stefani]
Lead singer of No Doubt. Released a solo album a couple years ago. Known for her flashy clothing.
P Diddy
Hip hop artist formerly known as Puff Daddy. Could recognize him if I saw him, but don’t follow his music.
Maroon 5
Pop group, current hit “Moves Like Jagger”. Adam Levine is cohost of The Voice, a TV competition show to pick talented musicians.
Christina Aguilera
Pop singer. Former Disney channel star, turned sexy singer, now cohost of The Voice. Used to be skinny, now a bit more plump, but has boobs (frequently demonstrated on The Voice).
Katy Perry
Hit pop star, first hit “I Kissed a Girl (and I liked it)”. Lots of songs about teenage partying. Married to that British guy, Russell Brand. Known for dressing in funky outfits.
Justin Timberlake
Pop singer. Exposed Janet Jackson’s boob. Former boy band member, also something of an actor.
Beyonce
Pop singer. Blingy. Somewhat actress. Known for her thighs.
Justin Bieber
Pop singer and teeniebopper heart throb. Don’t know his music.
Nikki Minaj
Never heard of her.
Snoop
Hip hop artist, aka Snoop Dogg. Occassional actor. Numerous run-ins with law enforcement. Pitch man for Girls Gone Wild. Says words strangely to be hip.
Jay Z
Recognize the name as a pop star. Not much else.
Black Keys
Pop group. Heard a couple songs on radio, not really into them.
Adele
British pop star, known for Rollin’ In The Deep.
Glee
Hit TV show about a high school glee club trying to transform from the geeks to the school stars. Over the top presentation of high school. Big musical numbers. Can’t stand it.
Florence and the Machine
I 've heard of them, but that’s about it.
But I do listen to Top 40 radio.
My take is all the internet social media - Facebook, Tumblr, Twitter, etc. And texting. Not necessarily being aware texting exists, but actual use.
Smartphones and all their gadgets and apps.