Any UK tax resident aged 18-39 can open a Lifetime ISA. Once you have opened a Lifetime ISA, you can pay into it every year until you reach 50.
Please note that your Lifetime ISA is considered open once you complete your first deposit of at least £1.
To use the Lifetime ISA towards a property purchase, you must be a first time buyer, and the property must also meet HMRC’s general criteria, which you can find summarised here 🔍🏘️