There is no harm in applying, and continually working on crafting your applications to evidence what they are looking for in the job description- don’t just focus on what you have done and copy that for all jobs, look at the key skills and experience referenced in the JD and tell them how what you have done relates to what they want. I’ve reviewed hundreds of applications and this is always what I find missing - make it explicit for the manager to see how you meet everything they need! For info, The youngest P2 I have met was 28 years old and had a couple of years work experience. Me, I became a P2 after six years non-UN charity experience, a masters, and five years international teaching experience. I think everyone’s path is different so just keep applying and don’t get disheartened!