Stephen Colbert had a huge 2025 - and he's got one big lesson to share after getting through it. While speaking to Andy Cohen, 57, and Anderson Cooper, 58, during their New Year's Eve coverage on CNN, Colbert was asked to reflect on the past 12 months. "So much has happened in the last year of your life, I'm curious what you left last year, having learned? What was the major lesson that you learned?" Cohen asked.