From my experience:
1. Establish positive image of self. I am saying this because I have a coworker who is over 40 and with company for over 10 years, she is always giggling like a girl. Though she works hard and is a very nice coworker, she hasn't gotton what she should've deserved. For me, I would prefer others to consider me as a professional woman, not innocent girl.
2. Be assertive and decisive. This way, can show your confident and reliable image....