How old were Twilight Sparkle and his friends in the last episode of the ninth season?

Ziyue 2 1 year-old, Biqi 2 1 year-old, Rourou 24 years old. According to the plot of "Little Polly Season 9", in the last episode, Zi Yue was 2 1 year old, Biqi was 2 1 year old, Rourou was 24 years old and Bao Yun was 22 years old. Polly Pony was a toy launched by Hasbro in 1983, and later TV cartoons and movies were also launched.