The eighty-year-old gentleman still writes without pause.
Tips
history
耄 (mào) originally meant 80-90, 耋 (dié) meant 70-80 - 《礼记·曲礼》: 八十九十曰耄,七十曰耋. Modern usage blurs them into a single honorific for very old age. Both characters share the 老 (old) radical at top.