Fubuki and Tatsumaki are two popular characters from the manga and anime series One Punch Man. Both characters are powerful heroes who are members of the Hero Association. While their ages have not been explicitly stated, there are some clues in the series that suggest their approximate ages.

Fubuki, also known as the Blizzard of Hell, is the younger sister of Tatsumaki. She is the leader of the B-Class hero group, the Blizzard Group, and is known for her telekinetic abilities. Fubuki’s age is not revealed in the series, but she is believed to be in her mid to late 20s. This is based on the fact that she is shown to be more experienced than many of the younger heroes, but not as experienced as some of the older heroes, such as S-Class hero Bang, who is over 80 years old.
Tatsumaki, also known as the Tornado of Terror, is one of the most powerful heroes in the series. She is an S-Class hero and is known for her incredible telekinetic abilities. Like her sister, Tatsumaki’s age is not revealed in the series. However, based on her appearance and her status as an S-Class hero, it is believed that she is older than Fubuki, possibly in her mid to late 30s.
It is worth noting that in the One Punch Man universe, characters with superhuman abilities often have longer lifespans than normal humans. For example, Saitama, the protagonist of the series, has been shown to age at a much slower rate than normal humans due to his incredible strength and durability. It is possible that Fubuki and Tatsumaki also have longer lifespans than normal humans, although this has not been explicitly stated in the series.
In conclusion, while the ages of Fubuki and Tatsumaki have not been explicitly stated in the One Punch Man series, it is believed that Fubuki is in her mid to late 20s and Tatsumaki is in her mid to late 30s based on their appearances and statuses as heroes. It is possible that they may have longer lifespans than normal humans due to their superhuman abilities, but this has not been confirmed in the series.