A couple of years ago during lockdown, I was working with someone definitely qualifying as a boomer, to start up an e-commerce site for him. He was proudly showing me his ledger book of checks that he had to shell out $200 to receive while declining a debit card. On a couple of occasions, I went with him to get cash by driving to a bank branch, writing a check, and having the teller cash it for him. It took months to convince him that he absolutely needed a debit card when people were constantly asking if they could use Venmo/CashApp/etc to pay for products.
So we're still in a transitional stage where some people are still stuck on using checks.
At least I see them being used less often in stores. Also how on earth was he paying $200 for checks? You can get them for < $15. Here's a book with a fish on it, and a ledger, and a cover for under $25 https://www.checks.com/p/856/wonders-of-the-sea-checks