user: Question: What is the average number of years on learners of the drivers over the age of 24 with less than 0 attempts at the licence test?
Columns: ['Learner driver', 'Partner', "Driver's Age", 'Years on learners', 'Licence test attempts', 'Passed Yet']
Types: ['text', 'text', 'real', 'real', 'real', 'text']
Sample row: ['Sharni Freeman', 'Chris Martin', 27.0, 12.0, 0.0, 'Yes - Episode 11']
SQL:

assistant: SELECT AVG("Years on learners") FROM "Table" WHERE "Driver's Age" > 24.0 AND "Licence test attempts" < 0.0;