well, if you read the case literature or anything with "live examples" of people talking about their type (such as what Berens often includes in her pieces), you'll see that most of them are focused on people in their 20-60's.
So there's a large coverage of older people in those situations who are attached to a particular type reading.
Type is complicated. It's hard to get a detailed picture of people with age that will fit everyone. That's why the focus is usually on motivations, those can be distilled from people of any age into general truths.
The other thing is that people aren't necessarily mature as they get older. Age is just one part of things, but there are 40-50 year old people who are more immature and "raw" than 20 year olds in their type. We also are impacted by the family and culture we were raised in, which might have forced us to either develop functions we did not prefer or distorted our personal growth badly enough that we are WORSE off than we might have been.
So these are some of the issues with making a USEFUL and uniform type rep for people of different ages. We could still probably tease out some similarities but there is still variation involved. I think most of the approach (and off the top of my head, the place where I would start) is based on the Inferior function (4th function) development in older people. Because that's where the largest difference would occur and be noticeable: People who focus on their primary and ignore their inferior look much different than those who have fought and worked and developed their inferior. When you deal with lesser functions, or functions that are not in such strong opposition to the primary, then the differences are harder to tease out.
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