They usually go out 75 years and I think the shortfall is about $12 trillion, over that timeframe.
The real problem is Medicare, the shortfall is something like $47 trillion, IIRC.
Medicare’s current expenditures are roughly $1 trillion per year and have been doubling every 8 years since 1980.
That means:
In 8 years, they will roughly equal all current Federal tax revenue.
In 16 years they will roughly equal all current Federal expenditures.
In 32 years they will roughly equal current GDP.
Something’s going to break.