“old / aged” in Japanese is 老, read rou, o, fu (ろう, お, ふ). It is a Grade 4 Kyōiku kanji, taught in year 4 of Japanese elementary school, and appears in words such as 老人 (elderly person).
What does 老 mean?
公園に老人がいる。
Same sound, different character — the classic trap. Compare them side by side: