If a man after the age of 40 enrolled in college, is it ...?

YES, if he is a full-time student.

Pursuant to Article 23 of the Law of Ukraine "On Mobilization Training and Mobilization", the draft for military service during mobilization is also not subject to a special period of professional (vocational-technical), professional pre-higher and higher education, assistant trainees, graduate students and doctoral students who are studying full-time or dual forms of education.