methinks you might be right.
Marriage cert is a cert. copy of the original, definitely says aged 23 years.
Liars usually stick as close to the truth as possible, saves getting caught out.
I found another marriage to Ellen Grace Pateman, 1903 2q Wandsworth ID 1349, Albert Sidney Simmons.
If its my guy, he was certainly busy!
There is also a "wifes petition for divorce - Ethel Simmons 1929, (National Archives Kew Divorce Court file 7043
Hem ref J77/2470/7043), not sure how to look into this further. Kew is a long way from Auckland!
I am sure I noted a son born to his marriage to Ethel, and wrote it down, can't find it so will check it out and see if it comes to anything.
Cathy