Your age will not limit your chances for admission at Boalt or Stanford. Very few attorneys have any training in hard sciences, and you will likely be employable no matter where you go to law school. For most (if not all) biglaw IP jobs, however, a degree from a prestigious school is pretty much required.
Consider this, however: if you can score 170+ on the LSAT you may get a full ride at Hastings, Davis, UCLA, or USC. If you are intent on staying in Silicon Valley it might be better to stay local, make connections, and graduate with no debt. Although none of these schools are T14, all they are well respected.
Here's my unscientific anecdotal evidence: I know a guy with a PhD in microbiology and a JD from Hastings. He was hired straight out of law school by one of the biggest firms in California (patent law), no problem. He actually had several job offers at graduation and got to pick and choose. The other new hires at his firm had JDs from Harvard, Stanford, etc., but his science background got him the job.
Good luck!