Answer:
Some ages that Mark could possibly be are...
16, 17, 18, 19, and 20. I found my answers because to have a job or work at a program, you have to be at least 16. So Mark could be 16, 17, 18, 19, or 20. He would be able to work being 21 because that is the drinking age and you are already in the adult stage and you are old enough to be responsible with what you do.
Step-by-step explanation:
Hope this helps and have a great day :)
