Thank God I'm not the only one op!
I'm 31, and I feel exactly the same as you - in fact I could have written this very same thread.
I was at university a few weeks ago and we're only given a 10 minute break to divide our 3 hour lesson. The café is quite a walk away, so you really have to be definite as to whether you wee, get coffee or check your phone. Our break had just started, and as I picked up my bag to go to the café, I received a text. I read it and put my phone back in my bag and headed for the door. The 19 year old student who I sit next to said to me, 'mate, what about that text?' I honestly didn't know what she was getting at and said 'what about it?' She looked absolutely stunned, and told me there's a '10 minute rule' - you're meant to reply within 10 minutes of receiving a text apparently.
I told her that I thought the 10 minute rule was ridiculous, and that I feel so very sorry for her generation if this is the type of pressure they feel they are under. In every single class and lecture, she keeps her phone either in her hand or on the desk, and she constantly does snapchat, instagram and Facebook throughout. I think it shows appalling manners to our lecturers, and a shocking attitude to her studies, and if I were one of her lecturers I would have to say something to her. She is not the only student of that kind of age to be doing so either.
Selfies, and constant and efficient messaging etc must really take its toll and highly pressurise them. Fuck all that shit. I have a few real friends, you know in that old fashioned thing called real life, and they regularly wait several days for me to reply to texts. I think a huge problem nowadays is that people are messaging people who are Facebook friends etc, and not really true friends - the ones who would actually physically be there for you when the shit hit the fan, and they cannot be seen to 'lose face' amongst these almost virtual people.