OAA is oxford aviation academy.
age wise your fine, there are many guys on our course above the 28 age bracket so dont worry about that!
If you are struggling to pay for PPL lessons then you may struggle to pay for an integrated course as they require you to pay a subsequent amount of the training costs as a personal investment.
For OAA you will be loaned a max of 50 000 the rest is up to you, so that 13 500 for the course plus living etc.
good luck
Nick