Because she has been reliving the same weeks for a century, she is mentally over 100 years old . 3. Rika ( One Piece )
If you are asking about the British-Indian pop star (known for "For the Last Time"), she was born in 2000, making her 25 or 26 years old depending on the current date.
A major character in the famous horror/mystery anime.
If it's someone else, like Rika from Mystic Messenger or Pokémon Scarlet/Violet , let me know!
If you meant a different Rika (e.g., from Pokémon , Jujutsu Kaisen , or another source), let me know and I’ll provide the correct birth data and citation format.