Hi Hafza,
Your question sounds like you are considering joining as an officer. More information on the officer application process can be found here https://apply.army.mod.uk/how-to-join/joining-process/officer-recruitment-steps
You can be aged between 18-29. You don't necessarily need life experience, but you do need to demonstrate leadership potential, this is assessed during both briefing board and main board (the link above will explain what both of those involve).
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