Ask HN: How to survive Silicon Valley as a middle aged professional

Looking to understand what does one need to do to thrive in Silicon Valley after entering thier thirties and being a parent. I view the valley to be dominated by 20 year olds who will out work and perform you in a coding job for multiple reasons specially when you are a parent. How does one survive? Do you have to change roles and go into non development jobs like management or technical services or are there some alternative solutions. What's the best way to approach such aging issue