I'm old too, but FWIW, my current listening "platform" is a 30-year-old Sony boombox and a pair of Sony MDR7502 headphones. My most recent CD purchases have come from:But where do you buy CDs now? I’m old and I don’t even have a place to play CDs. My car doesn’t have a CD player, laptops are slotless, DVDs and BluRays long gone to Goodwill. But I do have 20 million albums available at voice command.
1) My local public library's semi-annual fundraising sales;
2) Amazon.com (mostly independent sellers hawking hard-to-find titles, often at a significant premium, but that's okay by me); and
3) A few independent record labels that are still selling CDs direct to consumers
I feel that any artist choosing to ignore my market segment risks significant sales. I do "get" the resurgence in vinyl releases, but a lot of us who lived through the cassette-to-CD transitionary phase are left yearning. Admittedly, I'm just a sample size of one, but I don't envision transitioning to Spotify, TIDAL, iTunes, et al. any time soon, and there are millions of us out there.
Keep listening...in whatever format works for you.

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