Erie definitely has settling, though if you've been looking at houses you might notice that every neighborhood has its own aging process. This has to do with the mitigation that builders did during construction. Some areas, like Meadow Sweet Farm and Country Meadows, are really minimal overall. You'll see it primarily in walkways and driveways. Just east of those subdivisions there is significantly more settling.
As far as the house you're interested in, your agent should be able to direct you to a certified inspector who can provide you with an objective report on the house's condition. No need to run...yet!
The bottom line is that some cracks are very serious and others of less concern. It generally is best to get an expert to look at the crack before drawing any conclusions. However, in this case, the cracks upstairs are also of interest and need to be seen by the same expert. There are problems with cracks in a number of homes along the front range, not just from general settling, but also from "expansive soils" (sometimes called bentonite) which cause cracks because they expand with moisture, putting pressure on the walls. As a result, it always is good to have a structural engineer look at a home if there is any question.
Prudential Real Estate of the Rockies
That question might best be asked of the planning department for the town of Erie. But, before getting to that, a more common question to ask regarding a home that is almost 10 years old is whether the foundation warranty has not expired. The usual warranty runs 10 years.
You can decide given the cracks whether a warranty that is about to expire is worth exploring.
You can always bring in an engineer to inspect. If I were the prospective buyer, I would insist the seller pay for an inspection by an engineer of my choosing. But, with all the inventory that is available, I would have to first ask myself why go to all this trouble?
PML of Longmont, CO
How was your house hunting over the summer?
I have (listed) a 2007 home in Erie, on the market for a week, with no cracks!
See 2079 Tundra Cir, Erie CO MLS #611754
Coldwell Banker Residential Brokerage
Like the other answer said we have expansive soils here and there can be problems.
This is something a Inspector should look at and determine.