Ahsoka Tano was 14 years old at the beginning of the Clone Wars, which started in 22 BBY (Before the Battle of Yavin), and she was about 17 years old by the end of the Clone Wars in 19 BBY. This means she aged roughly three years during the Clone Wars period depicted in the series

. She was introduced as Anakin Skywalker's Padawan at age 14, shortly after the First Battle of Geonosis and the start of the Clone Wars

. The timeline of the show and related media places her birth in 36 BBY, making her 14 at the start of the Clone Wars era and 17 by its conclusion

. In summary:

• Age at start of Clone Wars (22 BBY): 14 years old
• Age at end of Clone Wars (19 BBY): 17 years old

This timeline is consistent across multiple official sources and Star Wars media.