Verified answer

yes, with wikipedia you can find their ages, and if the information was made available, they will also have birthdays, height, jutsu, and more. (like in the first episode of shippuuden they showed how much taller naruto and sakura both got during the timeskip)

http://saiyanisland.com/naruto/

Good for everything Naruto related XD

Well, you can find out there age in Wikipedia but all other stuff i don't believe you can.

try at http://www.leafninja.com/ it has everything about naruto

http://naruto.viz.com/

http://www.narutofan.com/

http://en.wikipedia.org/wiki/Naruto