🇺🇸 Insider’s "Red, White, and Gray" investigation explores the costs, benefits, and dangers of aging leaders running the US, and the true problem of a gerontocracy.

👴 At 79, Biden is the oldest sitting president. He's raising concerns about how long he can continue governing, but allies say he's motivated by his agenda.

😱 Three of the last seven presidents broke the record for being the oldest. Click here to read about how age has been wielded in presidential campaigns.

🧠 Here’s how the brain of an 80-year-old president is biologically different from a 45-year-old president's.

📈 As part of the investigation, @Insider mapped out how Congress and federal judges have gotten older over time.

⚖️ Congressional staffers tell @Insider what it's like working for aging lawmakers.

👀 To read more from Insider’s "Red, White, and Gray" series, subscribe to @BusinessInsider or @Insider here on Telegram.