I just turned 27 and this perspective frightens me beyond I prefer to admit. I live in Toronto area, but want to work in Silicon Valley one day. One of my fears

I just turned 27 and this perspective frightens me beyond I prefer to admit. I live in Toronto area, but want to work in Silicon Valley one day. One of my fears is that by the time I turn 29 or 30, I may be "too old" to attract employers enough to relocate me. Well, just the more motivation to work on my github account...