Main concerns for a lot of mature students seem to be things like:
Can I afford to be out of work to study?
Will I fit in with all these kids?
Am I too old for halls?
It's been so long since I've studied, can I cope? I've forgotten everything I learned at school.
I'll be x age by the time I leave. What prospects will I really have?
Can I apply for that scholarship, or do the young school-leavers have more of a chance?
Then you have more complicated problems such as:
I have children.
I have a mortgage.
I am engaged.
The university is too far from my whole life.