Using ionic v1 in 2018

i have my old project using ionic v1, and i planned to use it again to make my new project
from what i read about converting ionic v1 project to ionic v3 will take much time, so i decided to still using my ionic v1 project
is it okay to still using my ionic v1 for future?
or do i really need to upgrade my project to ionic v3?

thanks

*sorry for my bad english