I am obviously late to the party but tried the how-old.net in the evening to very depressing results. So I thought I would experiment with different light and make up photos. And the results are staggering.
Day light, no make up: look 3 years older
Energy saving lightbulb, no make up: look 10 years older
Daylight cheap make up (Bourgeois health tint foundation and concealer): look my age
Daylight expensive make up (Clarins undereye concealer, YSL BB cream): look 5 years younger
Energy saving lightbulb, expensive make up: look 5 years younger
Well, I am grateful they got my gender right.