Convert text to date

Hi All,

I need help with this issue please ,

I have this column with ages written in format like for example  ( 2 years , 1 year , 13 month , 8 weeks )

I want to convert all these data to reflect the Number of Months only for it to become something like (24 ,12,13,2 ) . you can find attached the column I'm trying to convert.

Thanks All.