We moved here in our early 20s, although only from Devon so not much difference!
We already both had careers - husband with a national company and I got a new job just as I fully qualified. We are still here 30 years later but...
Both our children have moved away for careers as there are not many opportunities here unless you fall into the right categories. Make sure you have the better earner in work before you move.
However my daughter recently thanked us for bringing her up in Cornwall as she now lives in teh North and works with people brought up in large cities and her school years were almost "famous five" in comparison (assuming they managed to avoid the inevitable drugs and alcohol issues that are everywhere)
Finding somewhere to live here is awful at the moment as so many properties have moved to holiday lets. That might change if foreign travel resumes and the cost of power stays eye-wateringly high - but its unlikely to happen overnight and its terrible finding a place here at the moment. If you can live with MIL to start with that might be a plan.
Schools are rather hit and miss and long travel times means you don't really get much choice, although if you are near Plymouth there are some good grammars available to.those who qualify.
It's often said there's nothing for children to do but that's rubbish if your children are active. We have dancing, theatre, music, wild water swimming, running, footie, rugby, beavers, scouts, paddleboarding, beach activities, gig rowing, kayaking and plenty of summer jobs! The kids need to want to do these things though. Some simply don't.
Cornwall is a long way from anywhere. So 2 to 3 hours will get you to Bristol where the rest of the UK suddenly becomes accessible.
You will need a car. Or two. The public transport is awful.
I wouldn't have wanted to live anywhere else really. I don't mind busy season as its what helps our area thrive.