Not necessarily, I’m 24 and just about to exchange on a property in London but don’t consider myself upper middle class (was in foster care for 10+ years) and my job is average af. 

Becoming a homeowner depends on many factors. Two of the most important I’d say are living within your means (many young people leasing cars for fun as example) and some discipline (people complain that they can’t even save £50 yet they have so much disposable income when young).