veteran

"He is a student of life."

"The teachers at my school are very helpful and care about their students. "

"My sister is very helpful, especially when it comes to organizing things. "

"The teacher pointed out a particular detail in the math problem that several students missed. "

"My younger sister is very good at distinguishing different types of flowers. "

"Her insightful analysis of the book helped me understand the main character's motivations much better. "

"It was an experience he would not soon forget."

"Pit row was abuzz with activity."

"The annual family reunion was a great opportunity to hear stories from the veterans of the family's pie-baking competition. "

"a successful use of medicine;  a successful experiment;  a successful enterprise"

"The experienced teacher is mentoring a new graduate, helping her develop her classroom management skills. "

"The complicated instructions on the new software difficult me from completing the project on time. "