I'm from Australia and have always wanted to work in silicon valley, I have a few companies willing to sponsor me.
But I'm a bit concerned I'm too old now, and given that I don't know anyone in silicon valley I'd have to start my social life up again. I'm single with no dependants if that matters.
If the social aspect is one you're concerned about, maybe factor that into your job search, since people at work are who you will interact with most (both in general, but especially when you don't know anyone else). Specifically make sure you can socialize with the team, and maybe bias yourself towards slightly larger companies since there are more people there in general to socialize with.
If you look back on this and acknowledge I changed your life you can donate me a btc: 1Agbh1RJEgLCNWSeRzXGd4YCJFNeAyGD47
Some are 100% 20s bros, others are all over with more families etc.
You should ask people working there.