Can I change my non O visa extension reason in Thailand if I plan to marry?

A user visited the Amnat Charoen immigration office to extend their non-O visa based on their age of over 50. They inquired about changing the reason for their extension due to an upcoming marriage or obtaining a shorter extension than a year. The officer stated that both requests were not allowed. A comment from another user confirmed that if a reason change is desired (e.g., from retirement to marriage), it must be done at the time of renewal.