Bluey is canonically 7 years old, having turned 7 in Season 3 of the show. For most of the series, she was depicted as 6 years old before aging up in the episode "Pass The Parcel" (Season 3, Episode 14)

. Bingo, Bluey's younger sister, is canonically 5 years old. She turned 5 in the Season 2 episode "Handstand" and remains 5 throughout Season 3, despite the real-world years passing. The show’s timeline runs somewhat independently of real-world time, so their ages do not advance exactly with the years the show airs

. In summary:

• Bluey: 7 years old (turned 7 in Season 3)
• Bingo: 5 years old (turned 5 in Season 2 and remains 5 in Season 3)