How to leave finance for something else?

I've been working in IB for nearly 4 years (in M&A) in the UK and I can't see myself staying in this industry and want leave in the next couple of months.

I'm not getting crushed on or anything, I just have realised that I have 0 passion for finance (all of it) and find no part of the job engaging or exciting anymore (and I hate the tedious aspects like modelling and pitching). I don't want to work in PE because I generally hate DD and am just not that interested in investments. Corp. Dev I doubt I'd want to do either.

My questions are:

-Has anyone here completely changed track i.e. left IB all together and not gone down the PE/VC/ corp Dev path?
- if so, how did you go about it? Did you quit with nothing lined up to figure out what you want to do, or went back to education, etc
- at what age is it too "late" to drastically change careers? I'm 26.

My ideas are for what I might actually enjoy: Product management, Sales, operations.

I love working with people on teams, selling stuff, building a product (I launched a business at university which was a lot of fun)

Appreciate any advice :)