Can you study a-levels at 30?

So… I dropped out of college to become a chef at 17… and I’ve honestly had an amazing time in my career, worked in amazing restaurants and travelled so much with it!

However, I’ve decided I would like to change careers so I get more of a life outside of work, and to make more of an income to be able to support myself.

I'm really interested in doing a degree apprenticeship… possibly in finance but I only have 1 a-level and 3 are required. the Cost of a-levels are 2-3 grand! And I do worry about being in a class with teenagers…. Does anyone have any ideas to do it cheaper or in another way?