I work at a daughter company of a bank that develops said bank's internal software. Torn jeans are A-OK and might only get commented on when visiting the parent company. My team's architect is virtually never seen without a Chaos Computer Club hoodie.

Earlier in my career I worked for a well-established company in the medical sector. The only person in the company who dressed up was the boss – and only when meeting someone external.

I am 35+ and I'm both companies we had older team members.