The average annual household income in Waltham is $115,112, while the median household income sits at $95,851 per year. Residents aged 25 to 44 earn $114,807, while those between 45 and 64 years old have a median wage of $103,848. In contrast, people younger than 25 and those older than 65 earn less, at $84,063 and $53,028, respectively.