Great Post Inkling
Nancyboy
I am assuming your interested in products that fight the appearance of aging or help improve it more then all out makeup.
Here is a great site for men. I send some of my friends at work who ask this question here.
Mens Skin Care Products Facial Scrub
I like all natural products.
Some tips…
Excess hair in nose ears and on eyebrows, Get rid of it if you have it. Nothing says gross like hair coming out a guys nose.
Grey hair, unless you look good in it, Like George Cloony good get rid of it. They make mens formulas that are easy and not noticable and you can get them at any drug store.
Sunscreen in your facial products. Very Very important. The sun discolors and causes damage even if you dont sit out in it. If your gonna spend money to fight ageing but your wont wear sunscreen everyday its gonna be harder to do. If you cant go without the tan get a spray on like I sometimes do or better yet use the skin brightening tanning self tanners from jergins or oil of olay. SCRUB SKIN FIRST, If your gonna use them come back or pm me and I will explain this.
There are products like regenerist by oil of olay that help even out skin tone. The above site has a all natural one for men which I get for my hubby.
Scrubs. You need to get the old dead skin cells off your face and body before you put lotion on it. My husband uses my scrubs and those that I buy him from the etailers I shop from. They really do wonders for your skin. My husband couldnt believe the difference and now we fight over the scrubs in the bathroom LOL. You should use a scrub in the shower a few days a week. It improves circulation, brightens and evens skin tone, softens and improves skin condition and the face ones can diminish the appearance for fine lines. I use a all natural coffee scrub on my face from elementels. If you want me to point out some good ones just let me know and I will post some links.
I have normal skin tone not oily or dry so if yours is oily follow inklings advice above for that.
Teeth whitener Yes I agree with inkling. I use crest white strips. You would be surprised how much white teeth make you look younger.
Conditioner. I agree inkiling why dont men like to use it. My husband is the same way. I sneak it in his head and shoulders LOL. especially as your hair turns grey you need it. Grey hair is more course and bushy. Einstein is a perfect example of untended grey hair.
Makeup They have a whole line of things at above link to help men so they dont look they just came out of the rocky horror picture show. Some men at work use a few of the products and love them. The key is you dont want to look like your wearing makeup. 
Tisha