What profession do you want to study for? How many years to reach the end of the line with it?

TBH i can't see anything being an issue, 27 is still really young mate. I have a friend who began training to become a Vet around the age i am now, which takes a good few years i think and he succeeded. He done all this when living abroad in Canada and was well into his thirties.

Determination is all you need, Not sure why you feel you need to buy a house now? a few years wont make a difference.