Legally speaking, the majority of porn is only distributable to 18+ (some areas are 21+)
It is not recommended to go against this.
As a side note, however, the mental maturity of the person potentially watching the porn is the deciding factor; not the physical age. It's entirely normal for young men and women to be attracted to porn, but it (as all things) should not become an obsession. Use it responsibly; while no harm comes of it now, keep in mind that sexual activity later in life can become hindered by an obsession on one partner's part diverting attention away.