Same age here. Mid-thirties career switch into tech. Landed my first tech job at 37 (consulting), first startup at 40 (data engineering) and just started a new startup at 41 (data engineering/devops). I'm probably the oldest at my company by a decade. I don't think I look particularly young, but maybe? I'm not saying age discrimination doesn't exist, just that I've been lucky / fortunate enough not to have experienced it.