I am 19 and not a student. i live with my parents and they pay more than half of my living expenses. Can they still claim me on their taxes?

If you were 19 at the end of 2022 and were not a full-time student , no one can claim you if you had more than $4400 of income in 2022.

Only if you made less than $4,400 total income for the year.  

Paying more than half your living expenses is just one of two requirements to claim a dependent (who is not a student).  The other requirement is that your income be less than $4400.

In actuality, there are 4 more requirements, but those are the two main ones.

There are two types of dependents, "Qualifying Children"(QC) and Other ("Qualifying Relative" in IRS parlance even though they don't have to actually be related). There is no income limit for a QC but there is an age limit and student status test, a relationship test and a residence test. Only a QC qualifies a taxpayer for the Earned Income Credit and the Child Tax Credit. The Other dependent (qualifying relative) credit is worth (up to) $500 per dependent and is non-refundable.  

A person can still be a Qualifying relative dependent, if not a Qualifying Child, if he meets the 6 tests for claiming a dependent:

1. Closely Related OR live with the taxpayer ALL year
2. His/her gross taxable income for the year must be less than $4400 (2022).
3. The taxpayer must have provided more than 1/2 his support

In either case:

4. He must be a US citizen or resident of the US, Canada or Mexico
5. He must not file a joint return with his spouse or be claiming a dependent of his own
6. He must not be the qualifying child of another taxpayer