College Majors for Senior Citizens - Need Info

A growing number of senior citizens, myself included, are going to
college and taking credit courses. Some take a few number of courses;
some take a full load, going for a degree. In some states there is a
reduced fee (or no fee) for senior citizen residents at state
universities and colleges.
I am looking for information on what senior citizens are majoring in
when they either return to ot start college with the intention of
getting a degree(s).
It would seem that majoring in the hard sciences, such as chemistry
and physics, would not appeal to seniors who would have little
opportunity to use such training. But I cannot find much data about
what other senior citizens zre doing when they return. Anecdotal
evidence abounds. Is there any useful data on this subject?
Thanks for any help.