I've been a carpenter my entire life basically and I love the archeology involved in figuring out old houses. I am pretty good at dating them by what I find in the walls, and it's kind of a hobby of mine I guess to try to mentally undo years of renovations and picture the house as it originally was......
In the second pic, there is a missing board in the wall, I can see a vertical plank behind it which appears to be the structure of the wall. If so, then it's similar to the "barge board" houses we have here. I'm working on one now that is a mix of barge board and post and beam framing that we think dates to the 1850's...That style of construction was common here from the early 1800's to the early 1900's, basically dying out as wooden barges were replaced by steel. One good way to get an idea of date is to check the nails in the framing. Roof materials and door hardware are not the best method since those things are often changed over the life of a building.
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| Hand-wrought nail, before circa 1800 |
| Type A cut nail, circa 1790s-1820s |
| Type B cut nail, circa 1810s-1900s |
| Wire nail, circa 1890s to present |
(note: the dates on these nail types are not set in stone, in many areas hand forged nails were still in use late into the 1800's, and I've found cut nails in houses I know are from the 1940's, these dates are just a guide to rough dating)
Also in that 2cd pic, it looks like there is old cloth wrapped wire hanging from the ceiling, if the wiring is enclosed in the walls (installed during construction rather than added later) it will date your house from whenever electricity became commonly available in the area to the early 1960's when plastic coatings were first used. (Wiring added later does not mean the house predates electricity in the area though, it could just mean the lines hadn't been run out there yet when it was built...) A couple more pics of any electric fixtures (especially light switches) can help narrow that down.