I'm 55 and I use Twitter daily. It's a way of catching up quickly with my friends and family without having to visit a Facebook page (which I do not use) or texting (which I also do not use). I follow my favorite musical artists and authors, support various charities and help groups, and get links to many various articles and blogs that interest me.
My oldest son's first electronic toy was a VTech "boombox". He is now 28 and I just dug that toy out of a storage box and gave it to his daughter, my 1 year old granddaughter, to play with. It still works! I couldn't keep her away from my IPhone and laptop, so I found something 'gadgety' for her to haul around the house. By the way, she also loves her blocks, stuffed toys, rattles, and any old cardboard box that may be handy!:)
Except that I've never had any....from coffee anyway. I have been drinking at least 4 cups per day for the past 40 years and never had any adverse affects, it doesn't even keep me awake. Hell, at my age, I might actually welcome a hallucination or two.;)