Dates on census records.
It's very important to know the enumeration dates for census years when you're trying to figure out a birth year from the "age" listed on the census. The actual enumeration date may have not been a full 10 years between each census. For example, if a person were alive on 1 Jan 1920, their name was recorded even though they may have already died by the time the actual census was taken months later. For 1790-1820 census, the enumeration dates fell within the first week in August. For 1830-1900 census, the date was the 1st of June. For the 1910 census, the date was the 15th of April and the 1st of January was used for the 1920 census.
Names and dates on census records.
Census records should be used for placing families together, but do not rely 100% on the names or dates listed, and there's many reasons why information is "inaccurate" on a census record. People did not tell the truth to the census taker. Sometimes it wasn't the actual parent who answered the questions, but could've been a baby-sitter or a neighbor. Sometimes extra children appear in a record that were maybe a niece or nephew, or even a neighbor and the person responding didn't know that. Also, birth dates on census records vary quite a bit. I've found that most dates are fairly accurate when a couple is very young. Then, the wife seems to start subtracting about 5 years from her age each time a census is taken, and gets younger. Then later on, the husband will decide he needs to play catch up, and his age will all of a sudden decrease about 10-15 years in a later census. However, once the couple reaches their 70's and 80's, then they're usually back to telling the truth again. Finally, census takers spelled the names the best they could. Census records contain good information, but they're far from being 100% accurate.
Click on either of the above links to access the 1930 census, which includes other states besides New Mexico and Colorado. You'll find some Gurule families living in Arizona, California, Michigan, Montana, Texas and Wyoming.