I am 36 with reddish hair and very fair skin, including fair eyebrows and eyelashes. If I don't get my eyebrows tinted and wear eyeliner and mascara, my eyes disappear and I look like a ghost.
I am, however, careful to do it very subtly.
I personally don't think eyeliner applied to the lower waterline is a very good idea on anyone over about the age of 25. Also, it makes the eyes look smaller, not to mention the fact that it can give you eye infections. But each to their own.
I use a soft kohl pencil in brown and apply in a very thin line on the outer half of my eyes, right in the lash roots on top. The idea is to make the roots of the lashes look thicker rather than have an obvious line. Then on the bottom, again just on the outer half, I apply it in very light small strokes (almost dots) at the lash root and use my finger to smudge it. It gives my eyes definition without looking like a 'line' IYSWIM.
If I'm going out in the evening and am wearing eyeshadow, then I'll run a little of that underneath my lashes too, using a flat eyeshadow brush.