Younger. Netflix, Dropbox, Stripe, Slack, Pinterest, Reddit is working on it, Smugmug, Thumbtack, a lot more I can't think of off the top of my head. Also I'm pretty sure Amazon has teams that maintain multiple services.
Then I'm glad I keep dodging the "cool and hip" hype-fueled companies.
Netflix, Dropbox, Slack, and Pinterest are all mature, profitable public companies. Not sure if they count as hype-fueled.
I'd say you're letting your biases blind you. Netflix writes mature robust code, mostly in Java, and uses microservices.
Amazon has more than one service per "2 pizza team".
Which ones? Amazon uses roughly 1-team-1-service, not 1-team-100-*micro*services.
Facebook famously built their main service as a monolith.
Edit: and don't get me wrong, I'm not saying services are bad - as long as they are the right size and with the right design rather than tiny.