I am replacing one 26' span of gutter and an elbow. I have no idea how old the gutters are - the house was built in 1955 or so. They are at least 24 years old. I do not know if the gutters are .027 or .032 currently. My sense was that they are .032 - they are very sturdy and have been hit by tree branches before.
I found this which, if true, suggests that .032 might be the better deal as ladders etc., are often leaned against them.http://www.usraingutter.com/gutter-thic ... erial.html
This particular section sits alone and does not connect with any other part of the gutter system, other than a downspout.
I had several estimates completed. Both contractors have solid references and were thorough .... one contractor listed .027 gauge and the other .032.