In the book, "Renly had been a boy of eight when Robert won the throne, but he..."
That's the missing first part of the sentence of Eddard's that I posted above. That would make Renly eight or nine years older than Dany. Of course, the younger characters have been aged, as have their parents (Ned is 35 in Bran's first chapter**), so this would affect various comparisons.
** - Sean Bean was 51 when Game of Thrones was filmed. To be fair, Bran thought that the fact that his father's beard was shot with white made him look older than 35.
*** - Before anyone asks, Stannis was a year younger than Robert.
That's the missing first part of the sentence of Eddard's that I posted above. That would make Renly eight or nine years older than Dany. Of course, the younger characters have been aged, as have their parents (Ned is 35 in Bran's first chapter**), so this would affect various comparisons.
** - Sean Bean was 51 when Game of Thrones was filmed. To be fair, Bran thought that the fact that his father's beard was shot with white made him look older than 35.
*** - Before anyone asks, Stannis was a year younger than Robert.