You don't need to be school leaver age to apply
Just like the traditional university route, there are no age limits. Provided you meet any eligibility criteria (for example, three A levels at A* to C grade) then you can submit an application.
The fact you're paid a full-time salary can actually make this route more appealing and accessible to someone that has already been in the workplace for a number of months or years but wants to return to study.