The Mishna Berura in siman 589 45 says (rough translation) any baal nefesh should not be somech on all these heteirim [ ie. the rama and the bach] and should be makpid on as much as he could. The Biur Halacha DH Af Bzman hazeh says many people are meikil because it is too hard to keep nogea beer etc. and therefore do not keep chodosh bchlal . But they should know just because theyy can not keep all of it it shoud not be batul lgamri. Because in our medina ( poland) the wheat is all yoshon Aand it is easy to keep. So one should try and keep it in the areas that are easy for him. ayin shum
The Gra in masseh rav holds it should be treated like any other deoraysa and therefore it is assur to give food that is chodosh to someone who will eat it.