A codger is an old man, typically one who is eccentric or characterized by his advanced age. The term can also be used to describe someone who is crotchety or difficult due to their years of experience and wisdom.
Usage examples
The old man walking with a cane down the street is a complete codger, always grumbling and shaking his fist at passersby.
My grandfather is a lovable old codger, always telling us stories from his youth and making us laugh with his offbeat sense of humor.
The old codger who lives next door spends his days tinkering in his garage, fixing up vintage cars and playing nostalgic music from the '50s.
Don't mind Mr. Johnson, he's just a cranky old codger who likes things done his own way.
Every morning, a group of retired codgers gathers at the local park for their daily game of chess, discussing politics and sharing life experiences.
Yeah, the old codgers who wrote this stuff didn't even know that the southern hemisphere or most of the western hemisphere of the Earth existed. (religion.blogs.cnn.com)
I had empathy for the old codgers who grumbled when the 911 went... (autoweek.com)
Conventional wisdom says that globular star clusters are the stodgy old codgers of the universe, but it turns out that many of these clusters are young (scientificamerican.com)