Taylor Swift turned 21 on December 13, 2010. At that time, she was a popular country-pop artist who had already gained significant fame for her music and songwriting skills. She had also been known for writing songs about her relationships and romantic experiences, which further added to her public persona and media attention. However, it’s important to note that celebrities, including Taylor Swift, are entitled to privacy in their personal lives, and details about their relationships may not always be fully disclosed or confirmed.

Around the time Taylor Swift turned 21, she had been in a relationship with several notable individuals. Some of the individuals Taylor Swift had been romantically linked to or dated around that time include:
- Jake Gyllenhaal: Taylor Swift was rumored to have dated actor Jake Gyllenhaal in late 2010 when she turned 21. The rumors started after they were spotted spending time together and attending events, but the relationship was never confirmed by either party, and it remains unclear if they were indeed in a romantic relationship.
- Taylor Lautner: Taylor Swift had previously dated actor Taylor Lautner, known for his role in the “Twilight” movie series, in 2009. Although they had broken up before Taylor Swift turned 21, their relationship was well-publicized at the time, and they were often seen together attending events and spending time with each other.
- John Mayer: Taylor Swift had a brief relationship with singer-songwriter John Mayer in 2009, who is known for his blues and pop-rock music. However, their relationship ended shortly after it began, and Taylor Swift later wrote a song called “Dear John” that was widely believed to be about her relationship with Mayer.
- Conor Kennedy: Taylor Swift was also briefly linked to Conor Kennedy, the grandson of Robert F. Kennedy, in 2012. However, their relationship was short-lived, and they reportedly amicably split due to their busy schedules.
- Harry Styles: Taylor Swift was rumored to have dated Harry Styles, a member of the British boy band One Direction, in 2012. Their relationship gained considerable media attention, and Taylor Swift later wrote a song called “Style” that was speculated to be about her relationship with Styles.
It’s worth noting that Taylor Swift’s dating history is a topic of much speculation and media scrutiny, and rumors about her relationships may not always be accurate. As a celebrity, she has often used her personal experiences, including her relationships, as inspiration for her music, which has led to widespread speculation and interest in her dating life. However, it’s important to respect her privacy and personal choices, and to rely on confirmed information from reputable sources. Celebrities, including Taylor Swift, are entitled to have their private lives and relationships kept private, and it’s essential to respect their boundaries and personal space.