I suspect you have never stepped inside a tech company in the valley of anywhere else.
There IS a lack of women in tech and especially software engineering roles. This is bad but is something that will change now that computer science is such a popular major. There are plenty of women who are product managers and designers and those are the roles that make decisions about the product.
There is a lack of older people at startups but startups are a young person's sport. I'm in my late 30s and I don't want to be working for startups for the starting my 40s. It's tiring as hell. There are plenty of older people in larger tech companies in SV.
At least for the past 30 years, every software organization I’ve ever even heard of, much less been involved with, was dominated by Asians (Indians in particular). That’s still lacking in diversity, but your mischaracterization makes me feel more like you have a specific axe to grind.
It is a problem for everyone is young white males are the ones building all the technology, because then the only problems we'll be solving is that of young white males. Having diverse teams builds better solutions and tech that benefits everyone in a society, not just the dominant demographics of SV