In the pilot episode of “Blue Bloods,” the age of Frank Reagan’s son, Joe, has sparked confusion among fans. Joe’s gravestone indicates a birth year of 1977, but there are continuity errors regarding his age. Frank refers to Joe as his eldest child, contradicting the birth order. Despite the confusion, evidence suggests Joe was born in 1977, making him 31 or 32 when he died in 2009. Continuity errors persist, leading to discrepancies in the portrayal of Joe’s age throughout the series.