I'm a model (signed with 2 pretty big agencies in London) and have 2/3 jobs each month usually. Started age 18.
Go on castings constantly though which gets tiresome.
Haven't worked for any designer brands yet but a fair few beauty/makeup jobs and swimwear/lingerie.
I'm also a student studying natural sciences at a university in London in my 2nd year.
I will be looking for a job relating to my degree after graduation but if my modelling picks up more before then I'll definitely dedicate full time to that after graduating.
(I'm 20 years old for reference)