Assuming 2.5% annual inflation, $50,000 annual expenses today will require approximately $110,000 annually in 30 years.
"if we assume that inflation is 2 1.2% a year for the next 30 Years that would mean that between now and 30 years from now the cumulative inflation will be right around 110%...if you need a $50,000 a year lifestyle today you would need about $110,000 30 years from now to buy you what $50,000 can today"