"Under current law, CBO projects, Social Security’s trust funds, considered together, will be exhausted in 2029. In that case, benefits in 2030 would need to be reduced by 29 percent from the scheduled amounts." https://www.cbo.gov/publication/52298
The Social Security trustees disagree and say that it will be solvent until 2034.
So, either 13 years or 18 years from now.