Board Thread:Naruto Discussions/@comment-30918569-20200829215844/@comment-32685487-20200902064145

Tht's whay I said "at least". We just know he was old enough to be an adult, and old enough to have one child that was old enough to have a child by the time of Boruto's generation. So Yagura's child was closer to Naruto in age maybe a bit older, and then of course Kagura is closer to Boruto's age.