Books · 1908
Nothing—so it seems to me…is more beautiful than the love that has weathered the storms of life. … The love of the young for the young, that is the beginning of life. But the love of the old for the old, that is the beginning of—of things longer.
— Jerome K. Jerome · The Passing of the Third Floor Back

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker finds love most beautiful once it has survived life's storms. Young love is described as a beginning, but love between the old is a start of something longer, quietly suggesting endurance, shared history and companionship deepen affection rather than ending it.
Context reviewed