Key takeaway: Over the last five years, hiring of white males for tech roles has declined from 47.5% to 33.3% (of total tech hires). Somewhat surprisingly, hiring of white females and all non-Asian minorities has barely budged. The major increases were in hiring of Asians, with women increasing somewhat faster proportionally.
No data on age at all. I'm guessing it would look pretty bad for those over forty.
Kudos to Google for publishing this in greater detail than ever.