But on Friday, D will begin the next chapter in his life.
"I will soon be 80 years old, so it's time," said D.
For half of his life, D has helped countless clients from behind his counter.
He said firearms were his main source of income over the years, but that never stopped him from trading for other items which piqued his interest.
"One guy had the old time hearing deals that you plugged onto your shirt, and he'd pawn that once a week," explained D.
He said it's because of the relationships he's built with his clients that he's stayed in business for so long.
"I was planning on retiring when I was 60, but kept putting it off because my customers have been so nice to me over the years and it's hard to quit."
D said he's always enjoyed meeting new people, and turning customers into friends.
But now, he's looking forward to spending more time with his grandkids and enjoying retirement on his ranch.
"Naturally every businessman is going to make mistakes, but I'm real satisfied with my years here."
Reporter's Notes by Ryan Robertson:
To show his appreciation to all his customers, D is hosting an open house event on Friday at his store downtown.
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