You can still look quite youthful at 42 these days if you pay attention to your figure, hair, clothes etc.
Its when you hit 50 (and the menopause) that it becomes more difficult to sustain that illusion of youth.
True, though for some people they just have amazing youthful genes.
Remember Chilli from girlgroup TLC? She is 42 now and looks like this;
She could actually pass for a young woman. Her complexion is flawless and she's obviously had no work done. I doubt she'll look all too different in 8 years time.