Question: how old are del and rodney?
Answer: Trigger and Del are the same age, suggesting a birth year of 1947 or 1948. "The Class of '62" (series 7, 1991) sees Del and friends attending a class reunion, suggesting a birth year of 1946 or 1947. The prequel drama Rock & Chips, set in 1960, shows Del Boy at 15, before Rodney has been born.