I just got a new job in my 50's. Everyone assumed I was a senior, despite me telling them "I don't have experience in the technologies you're using, so I'm probably not a senior in your organisation despite my decades of experience in the industry". Only one organisation actually listened to that and recruited me at the right level. The rest (that interviewed me) tended to recruit me at a senior level and then fail me for not knowing the technology well enough. Which got annoying.

Apart from that, I found the experience remarkably straightforward. But then, I haven't seen a tech recruitment market this hot since Y2K (in Berlin at least). It's a good time to switch jobs.