What's the deal with "Xamarin.Forms.Label.Font is obsolete"?

I'm using 1.3.

My question is simple: how do I get this warning to go away?

var nameLabel = new Label
            {
        Font = Font.SystemFontOfSize (NamedSize.Large),
                HorizontalOptions = LayoutOptions.CenterAndExpand,
                YAlign = TextAlignment.Center
            };

I can't find any consistent, clear documentation or explanation anywhere. Also I tried setting the label Style to title style, but it had no effect on Android or iOS (just rendered as default font).