Think about the nature of blood - go with just some creative dye placement. Start with a base that color, unless you're looking for that just-fed look. Because of all of that nasty blood teaming through your flesh giving it that healthy glow. Once you die, the blood stops pumping, and the skin takes on a lovely robin's-egg blue color. I personally have only seen it in a creamy white color - maybe some places have a more racially diverse selection.
Lets start with some shrivel.
Open your liquid latex bottle, and puff out your cheeks, like a trumpet player. Hold it for just a bit - let it dry. Now, let the air out. So, it wrinkles. Instant aging, at your service.