Leaving makeup on over night isn't good. It not only clogs your pores, but could cause little white spots on your face which is known as milia. The only way to remove these are by needle or something along those lines. Whenever you keep this pore clogging stuff on over night, it indeed ages your skin. If its one night, then I don't think it will cause much harm, however absolutely never make it a habit. Also, if you leave on eye makeup, you can give yourself an eye infection from what I've heard.
Unless the makeup is seeping through your cell membranes - all 50 trillion of them - and scrambling DNA and shortening telomeres, I seriously doubt it. In fact, your question is the first I heard of that.
She looks like 40?! I don't know about your 40-year women but that's harsh... Anyway, leaving it on after a late night once in awhile isn't dangerous. Though I suggest making a habit of removing it so as to clear the skin and letting it "breathe"
lol...idk if I should google that...but my first reaction was a big no.
I just think make-up is an enhancer...
the more you wear it the more people get use to you looking enhanced with it on
their reaction when you have it off is a bit different just because there not use to seeing you with it off.
hmmm...an example...its like when your in middle school all the guys are smaller then you they think they are never going to grow...there kind of the same when they enter into high school...during sophomore summer a lot of guys began growing...they go back sophomore or junior summer and your reaction to them is WOW! your taller then me now...if you saw them every day you would notice that they are taller but less likely to express it in that way...instead you might just think to yourself...he's gotten taller.
Anyway, off base example but I think it works. When people see some without make up they may say Whoa you look different or Whoa your not wearing any make up...when really you look less enhanced...
I don't wear make up when I sleep its uncomfortable and feels nasty to me lol but I would advise washing your face before you go to sleep..im not going to Google that theory but I doubt its true. at least for me.