According to a grammar book (Advanced English Grammar in Use, Cambridge) we should use "since" as follows:
"We use the present perfect in the time clause with since if the two situations described in the main clause and the time clause extend until the present." E.g. Since I´ve been able to drive, I've felt much more independent.
I wonder, is it correct to use simple present instead of present perfect in that sense? I.e, "Since I am able to drive."