Is it too late for what? To become a professional dancer, a recreational dance teacher, go into a career somewhat related to dance or to simply start dance classes again?
To simply start dance classes again - as long as you can walk and safely participate in dance classes, and can afford them (or your parent(s)/guardian can and are willing to afford them)- I believe no age is too late. Even for people with physical limitations, there may be dance classes that cater to their needs.
You said you said at 12 you started over 11 hours of dance a week, was that a sudden increase? You do not specify the nature of your dance training and the number of hours a week you danced after 12 years old, but however much or little you danced, and whether that training was recreational or pre-professional, unless your parent(s)/guardian would not let you take a dance class again or cannot afford or find one I see no reason why you could not do so.
If you are eager to take a dance class again, with your parent(s)'/guardian's permission, try out a dance class at a good dance studio (some dance studios may offer drop-in or (sometimes free) trial classes), and see where to go from there (e.g. whether to continue). It may be best to first contact the dance studio to see which level you should start back in.