The term "old fart" is commonly used to refer to an elderly person, but it can be seen as derogatory and disrespectful. Fortunately, there are many alternative words and phrases that can be used to convey the same meaning without offending anyone. For example, you can use words such as "senior citizen," "elder," or "veteran." You can also try phrases like "seasoned citizen," "golden ager," or "experienced individual." It's important to remember that older people deserve respect and dignity, and using kind and appropriate language is a way to show that respect.