primers for eye generally don't offer much in the way of smoothing out the skin, they are primarily used to get the eyeshadow to stick and last longer.
When doing eyeshadow for an older lady you really do have to approach it very differently to a younger eye. Matt eyeshadows work really well as it doesn't show up any crepe skin, also if your client has hooded eyes you will need to alter how you do your crease work.
You've probably already learned in that anything you darken recedes and anything you lighten comes forwards ,so for clients with hooded eyes i normally darken the whole patch of skin that is drooping and bring it in slightly over the lid to blend. Best way to do this is to get your client to close there eyes and raise there brows right up this will stretch the skin, darken in the outer corner , now get them to open their eyes and look straight ahead with eyebrows relaxed , you will probably notice that the bit you have just shaded has disappeared under the hooded part of the eye , darken all the hooded part (may well be up to 2/3rds of the eye) and blend outwards and bring in slightly along the crease this is will help to disguise the hooded eye and will be very flattering.
I hope that makes sense :biggrin: