I Curl 25 Lbs, and CAN curl 30 Lbs 10 full reps, but i have still have thin arms?

Actually i used to workout before and stopped for a year, before stopping i had bigger arms with 25 lbs than i do now, maybe im imagining. But even if i can work my way up to 50 lbs, will my forearms be much bigger? i mean what do these guys like hugh jackman and matthew mcConnaghey lift for that kinda arms/body. I just dont imagine much of a change going from 25 - 50 lbs really. 19 y/o, 6 ft, 135 lbs.