This comparison between age and size is only valid for Discus that are not stunted and naturally raised.
In fact, you can find 4″ hormonated Discus that will be only 3 months old or others that will be 1 year old with a growth delay.
Refer to our page to know the difference : http://www.discusparadise.com/index.php?page=pages/qualite-discus.html
5 cm – 2” : 2 months
6 cm – 2.5” : 3 months
8 cm – 3” : 4 months
10 cm– 4” : 6 months
12 cm– 5” : 9 months
14 cm– 5.5” : 12 months
15 cm – 6” : 18 months
17 cm – 6.5” : 24 months