Yes, older adults should go to college for most any reason they choose. An older adult may wish to move ahead in a career, and that career may call for a college degree. Alternatively, an adult may simply want to return to college to learn about new subjects. Either reason is valid.
I think that there is no limit on how old you can be to go to college because college is good. I think that it is good to expand your education about things that you are interest in working in. I think that going to school is good when you are seeking better.