I'm 30 this year and found myself wondering this. I live in jeans, converse and band/film t-shirts (currently sporting a Batman t-shirt). I'm not overly bothered but I've noticed that in the baby groups I go to and on the school run that other mums seem to dress a bit more 'grown up' or a bit smarter. At 30 should I be doing the same? I don't think I look my age but I worry slightly that I might look like I'm dressing like a teenager.