Nodine4: I don't think you're alone in feeling the way you do ... a lot depends on our circumstances. Some "older" people have more resources, e.g. an escape hatch from wintery weather in northern climes, a life partner to share it all with, lovely kids who never forget to call(!), overall good health (for our age...), good role models, jolly genes, etc. Personally, I do feel pretty upbeat many days, and grateful for what I do have ...but it varies with the changing scene...(NYTimes daily, PBS Newshour... ugh...) so I try to keep that minimal. Therapists can only do so much to help us reframe with CBT, empathic talk therapy, "prescriptions" for exercise, (and/or antidepressants), meditation, communing with nature if possible and with other people too... but can't really change the circumstances in which we live, just help us with our attitude toward them, and lend strength while we do it. Also, since most of them are younger than most of us, they often have a rosier belief system about old age .. just wait 'til they get here! For me, it's easier to be equanimous when I can accept that sometimes moods will darken (and it's normal) ... in spite of our best efforts. I'm old too, and diagnosed with Long Covid, so some days are harder than others, but as Elaine Stritch sang "I'm Still Here!" ... until she died, of course...
Good luck to you; I find these discussions helpful and supportive and hope you do too.