Working with adults, no problem!
So you have to work with an adult learner, and you have some concerns. Below is a comparison of the learning characteristics of adult learners and youth learners adapted from Rochester Institute of Technology. Of course, these are generalizations with exceptions occurring in each group of learners, but you may want to keep these differences in mind as you consider the learner population you will be working with.
Adult Learners
Youth Learners
Problem-centered; seek educational solutions to where they are compared to where they want to be in life
Subject-oriented; seek to successfully complete each learning task, regardless of how the task relates to their own goals
Results-oriented; have specific results in mind for education - will drop out if education does not lead to those results because their participation is usually voluntary
Future-oriented; youth education is often a mandatory or an expected activity in a youth's life and designed for the youth's future
Self-directed; typically not dependent on others for direction
Often depend on adults for direction
Often skeptical about new information; prefer to try it out before accepting it
Likely to accept new information without trying it out or seriously questioning it
Seek education that relates or applies directly to their perceived needs that is timely and appropriate for their current lives
Seek education that prepares them for an often unclear future; accept the postponed application of what is being learned
Accept responsibility for their own learning if learning is perceived as timely and appropriate
Depend on others to design their learning; reluctant to accept responsibility for their own learning
In summary, adult learners usually approach learning differently than younger learners:
They are more self-guided in their learning.
They bring more, and expect to bring more, to a learning situation because of their wider experience - and can take more away.
They require learning "to make sense" - they will not perform a learning activity just because you said to do it.