In cases of pics of myself I have used the same model release for a while - I presume I should upload a new model release when I cross an age boundary (or in my case is it possible to re-associate pics from a different age category with a different model release?) since it has been a number of years and photos since that happened.
I get a 404 error when I clicked on the "what do we mean by ...." link.
I presume we are to label people of mixed ethnicities/race as both or do we go with the USA method of just a little non-white makes one the non-white category.
You likely don't need to add a new release of yourself. You should be able to simply update your age range and any other relevant information in the Model Tagger. That will apply to the filters when they are in place. The keywords you apply to your current content should also accurately reflect your age range when the photo was taken.
As far as ethnicity is concerned, you should select the options that accurately reflect the identities of the models you work with, including yourself when you are in front of the lens instead of behind it.
Thanks for the questions,
Mat Hayward