I never heard that mac is "stage makeup" I'm a MUA & I never heard of this.
I wear mac foundation & powder, i'm 34 I don't look a day over 25.
Things to do to help your skin
- drink 8-10 glasses of water a day
- wash all makeup off before going to bed
- exfoliate 1x a week
- use SPF
- do not use a sponge when applying foundation, use a brush. If using a sponge throw it out, do not reuse
- make sure all your brushes are clean
- moisterize day & night, apply eyecream & night - your never to young to start moisterizing
- limit yourself to alchol
If you do these things for your skin. Your skin will thank you later. If you have prob. skin goto a dermalogist.
Hope this helps