Oily Skin... Advice on product & care?

I use to have very normal, flawless and supple skin during teen years and early 20s. Lately, as im reaching late 20s, my skin turn oily and dull. currently i'm using neutrogena range for oily skin. is there any better skin care out there? and why do my skin suddenly become oily as i age? shud'nt it be dry and flaky?