At my age (mid 40s), I have found some foundations break me out! I couldn't believe it. But when I switched products, the breakouts went away.
A woman knows her own skin, and if there's something different, it's time to look at either new makeup, or a new skincare product. Either one can cause allergic reactions.
I keep a bottle of Aveeno lotion (or the knockoff from the discount store). It soothes my skin, and really helps decrease the effects of an allergic reaction to my makeup.
Also, have at least one day a week that's makeup-free, to give your skin a rest. It helps.