Chiming in with always! We love mature students.
I'd say, too: please make sure you are accessing all the support you're entitled to get. Mature students can be bad at this - if you've been very capable for the past two decades, it can be second nature to assume you should handle everything on your own, but that's not how degrees are designed to work.
Have you asked your tutor/course leader about the amount of joint work? Or raised the issue that it's less than ideal for you? It might be they simply don't realise that, and could vary the process. At the very least, they should be able to tell you whether such 'group' work will continue to be so substantial, and you'll be able to plan/see the light at the end of the tunnel.
Could some of this group work be done over skype? Could some of it be done via email? If you can, raise this with whoever is responsible for the module. IME, universities are trying really hard to show they have strategies for flexible, digital learning, so there's a decent chance they'll actually want to make this work.
Of course, your tutor may not be very helpful (and, if so, keep talking when you change tutors/start a new bit of the course). But it's definitely worth raising the issues. Otherwise, no one will really understand that you're facing challenges like this.