User blog comment:Romerox/How many years will be calculated for each of the characters/@comment-212.219.98.117-20101202125717

Dan has specifically said that Phineas and Ferb are the same age. Ferb is certainly taller than Phineas, but there is a lot of variation at their age, not all children the same age are the same height. People tend to go with the episode 'Phineas and Ferb's Quantum Boogaloo' as the basis for working out their age; once they arrive 20 years in the future, Linda says that the boys are 30. This also confirms the fact that they are the same age. Candace is definitely 15, that has been proven in the episodes. Jeremy's age is never questioned, but it is possible that he is 16 as he is shown driving a car. Vanessa is also definitely 16 because she had her birthday during 'Dude, We're Getting the Band Back Together' One of the reasons that the creators made the kids ages vague and difficult to work out is because they want the characters to appeal to a wide audience.