If a coworker is belligerent to an 18 year old, they are assholes. To a 35 year old (at least to me), the first thing I think of is that I have no idea what their home life is like.
People endure crazy life experiences. I am working with them on a problem that results in revenue for both of us. Just because we're making money, doesn't mean that they're dealing with problems of personal identity, cancer, financial ruin, etc.
Age matters, kid. It fucking sucks. It's cool that you're punk rock about this. But you will achieve more & achieve faster when you realize that age really does matter.
(p.s.- age is not a way to measure wisdom, but it is a wisdom indicator)