Congrats! first off.
There are several web sites you can check for competitions of choice.
If you and your husband "compete"..
you would be an "amateur" couple.
Read the rules of each organization carefully as it can vary. Most will have a calendar that you can check to see when and where and costs of a competition. Also, an even better deal is to check out your local colleges and universities in your region as well as checking with your teacher.
Colleges and universities might also have ballroom dance teams that actively sponsor social events, competitions, lessons, etc as well as checking with your. Don't worry about your age, organizations break the age groups down. Try looking at National Dance Council of America, USA Dance chapters, accessdance.com or just goggle ballroom dance competitions. Happy reading (-: