Mendes bests the rise of an artist for whom he has opened on tour (and over whom he can now boast chart bragging rights): Taylor Swift posted her first two AC No. 1s at age 19: "Love Story" and "You Belong With Me," both in 2009. She had to wait until the advanced age of 20 to notch her third, "Mine," which hit No. 1 on Dec. 11, 2010 (two days before her 21st birthday).
Before Swift, Mariah Carey collected her third AC No. 1, "I Don't Wanna Cry," nearly three months after turning 21 in 1991. She logged her first two career-opening No. 1s, "Vision of Love" and "Love Takes Time," at age 20 in 1990.
Mendes has helped lower the average of age of lead soloists atop the AC chart in 2017 to 22.6 years (with, notably, Alessia Cara reigning earlier this year at age 20). Five years ago, the average age was 35.6 (lifted by then 67-year old icon Rod Stewart in the mix). Ten years ago, in 2007, the average age for soloists atop the tally was 29.4.
In September, Mendes likewise became the first artist to have notched three No. 1s before age 20 on AC sister chart Adult Pop Songs (which began in 1996). He managed the feat with the same three songs that have crowned, and earned him history on, the AC chart.