There are a few George Stevenson currently set up with merges needed since a few got set up. Once the merges are completed, I think he will be connected.
Census age is consistent in those that I found, but remember that there can always be other people with the same name in the same location. 20 years is also a generation difference, So could be a Louise that is married to a child, nephew, uncle or non relative that matches the age.
Remember that Sources is the important part to try to find to connect the profiles to the correct information. Many people have family stories passed down, but when they find the actual sources, the Information might be a little different.
Since you are new, you can always send a private message to any of us to ask for help with getting your tree started and getting it connected on wikitree. Just select our name below our comment, select our wikitree ID to go to our profile and find the send private message.