Then again almost every show in Japan has moderate cussing, but mainly just s*** and h***. Never anything like the f-word.
And technicaly, in the last what, 15 years? He's aged a year. The celebrated Ash-Pikachu's 1st anniversary in one of the movies, so that means he's at least eleven.
In Japan, Ash (known as Satoshi) is always so much more serious than in America.. It's weird. He's not all like "Let's be besties forever! <3<3<3 Sparklezz!", but like, "COME FACE ME YOU COWARD"