Yes, generally they are suitable for a wide range of ages. They often contain elements of adventure, mystery, and friendship which can be enjoyed by both kids and young adults.
Adventure is a major theme. The characters are constantly on exciting quests. Another theme is friendship, as the characters rely on each other. Mystery also plays a big part as they often have to solve strange phenomena.
I'm sorry, I don't know Sarah Jane Salazar personally, so I can't provide her life story specifically. But generally, a life story could include details like where she was born, her family background, her education, and her career path.
Adventure is a very common theme. Given her character's history of traveling with the Doctor and having her own adventures, many fanfictions continue this trend, taking her on new and exciting missions. Another common theme is friendship, especially her relationships with the Doctor, her companions, and the friends she makes in her own series. It often explores the deep bonds she forms.
Social media platforms can also be a source. Look for Doctor Who or Sarah Jane Smith fan groups on Facebook or Twitter. Some fans might post links to their fanfiction there or discuss where to find the best ones.
One popular character is Charley Pollard. She is a lively and intelligent companion of the 8th Doctor. Another is C'rizz, an alien with his own set of unique abilities and a complex personality.
The novels in the Eighth Doctor Adventures typically have exciting plot twists and a focus on the Doctor's evolving personality and relationships with companions. They often incorporate elements of time travel and intergalactic conflicts.