Old fuddy duddy

"Old fuddy duddy" is an informal and playful phrase that refers to a person, typically an older individual, who is conservative, old-fashioned, rigid, or resistant to change. It describes someone who is set in their ways and is often disapproving or critical of modern trends, ideas, or styles. The term is usually used light-heartedly or humorously to affectionately tease or mock such a person.