There is not a "true" answer here, probably Gasoline Alley's creator Frank King did not foresee the strip lasting long enough for this to become an issue when he decided to have his characters age in real time. In recent strips Walt's birth year has been given as 1900, which would make him 111 or 112, but strips from the early years suggest that he was born before that (for example, he served in World War I; and a 1900 birthdate would make him just 21 when he adopted Skeezix, who himself is 92 now). And there have been notable inconsistencies in the real-time aging, for example Joel and Rufus have not aged perceptibly during their decades in the strip (Joel is also a World War I vet, and so would have to be well over 100 now too).
So anyway, the short answer is Walt is old enough to have left the current GA cartoonist with a pretty sticky dilemma...he had some of the other original key cast (Doc, Avery, Bill) die "off-stage," and the death of Walt's wife Phyllis was depicted in the strip in 2004. Whatever he does is not going to be the end of his problems if the strip continues, since Skeezix and Nina are now both in their 90s.
"Skeezix" was a character in the comic strip "Gasoline Alley," created by Frank King. The comic strip debuted in 1918 and is one of the longest-running comic strips in American history.
The first comic strip was created in New York City. It was called "Hogan's Alley" and debuted in 1895.
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The first comic strip to feature characters aging in real time was "Gasoline Alley" by Frank King. It was first published in 1918 and followed the lives of a group of characters as they aged and went through life events.
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