25 lbs isn't much for a touring bike. Most touring bikes are 30 lbs. The only bike I know of that might meet your criteria is the Masi Giramondo. It has low gears and relaxed geometry, though I think it's pretty average weight for a touring bike. If you have knee issues it might be worthwhile to consider an e-bike, though they cost more.
https://masibikes.com/collections/ad...ondo-700c-2019