I like the look of old colorized black and white photos. How can I edit my digital photographs to look like that?
Note that the workflow for these images was from film B&W image to digital color, and that it is highly unlikely that a single setting was used for all of them (likely a lot of different tweaking was applied, as the images include some 19th century ones shot on ortho emulsion and some late 20th century ones on panchro emulsion - the color rendition is way different, especially of the blue sky and women's dresses).
But if you must you can try the Nik Collection of filters to your digital work. It is free, integrates well with Lightroom and the
Analog Efex Pro can give you results similar to what you want. Pay a special attention to color (de)saturation.
Crisper images have more contrast meaning the scale or transition from max black to pure white is abridged. This is the vivid color imaging of Technicolor and the original Kodachrome. Photo engineers striving for a more faithful image caused color imaging to evolve. We are taking about lengthening the scale of the image. Some like higher contrast “postal card” images. Some like images with long scale and believe these are more true-to-life. Beauty is in the eye of the beholder. To achieve a Technicolor type look, just increase the contrast. By the way, I think Kodachrome II ISO 25 made the most attractive images.
Black and white prints were frequently over coated with water colors or transparent oils. These featured subtle colors you would call them pastel colors.