Trump stumbled through two public moments at the NATO summit, raising fresh questions about his mental sharpness at 80 — bad news for his image and for anyone hoping for younger leadership.

• Trump referred to the "Islamic Republic of Japan," a slip he could have brushed off as a one-off misspeak.
• He then pointed at Ukraine's Zelenskyy and called him "President Putin" — twice, without catching himself.
• The moments echo the same cognitive-decline concerns that dogged Joe Biden late in his term.
• The bigger point: both parties keep electing leaders in their 80s, and there are no upper age limits for the presidency.

Outlook: Expect more scrutiny of Trump's age and mental fitness, and renewed calls for younger candidates, but no actual age-limit rules are likely soon.