My mom, who is 79, does not have a computer nor wants one. She writes checks to pay her bills and uses her credit card for store purchases.
I write checks to pay my bills from home and use my debit/credit card for store purchases. I rarely use my card for debit, always use it for credit unless I'm at Costco and I have to use my debit. I also have a separate credit card that I use for trips and large purchases. I pay for a lot of things with cash because I spend less that way. Something about physically seeing the cash leave my hands makes me more aware of what I am spending.
I stopped paying my bills online when my bank began charging me $10 a month for the convenience. I will not let do automatic draft because we are self employed and sometimes the money is not there on the day it is needed. I also do not like another company having the ability to draw money out of my account but that is my preference. If someone else wants to do it, that's fine by me.
I pay for my groceries with cash. And I also use recyclable bags.
Believe it or not, there are still businesses that will only accept cash or checks. Especially in rural areas.
My kids in college use totally use debit. They write a check occasionally. They don't carry cash and have regretted it a time or two. I always tell them to carry $10 - $20 in there wallet for emergencies.