I have the 2020 chorus 12 with 48/32 chainrings and 11-34 cassette. It works great for climbing the very steep hills in Colorado. To get any lower gearing, you'd have to buy an after market 46/30 crank. Even that wouldn't gain much.
When I was in my 50's I used a 50/39/28 Campy 10 speed in the mountains, but only used a 12-25 cassette. My new gearing is lower than the 28/29 that I could have used, back then.
FWIW, I'm 66 years old with two replaced knees, but weighing under 140 helps on the climbs.