To open a Lifetime ISA (LISA), you need to be aged at least 18 and under 40. Having opened a LISA account, you can keep paying in until the day before your 50th birthday.
If you’re 40 or older, you can’t open a LISA – unless you’re transferring in an existing LISA from another provider.
LISAs can only be opened by individuals. And you must ordinarily be a resident of the UK, a Crown employee working overseas, or a spouse or dependant of a Crown employee.