John Foster was 18 years old during American Idol 2025 (Season 23).

Quick Scoop: How old is John Foster on American Idol 2025?

Multiple entertainment outlets and show coverage pieces describe John Foster as an 18-year-old country singer while he was competing on American Idol Season 23 in 2025. One feature highlighting his early performances explicitly refers to him as “18-year-old John Foster” bringing his country charm to the Idol stage. Another report on the show’s Top 10 stage includes John himself correcting online rumors, stating clearly, “I am 18 years old (not 24),” addressing misinformation about his age.

A profile covering his rise into the Top 14 also notes that John is 18 years old “right now” during the 2025 season and emphasizes his identity as a young country artist with a cowboy hat and guitar. Later coverage of his post-Idol career mentions that he would be performing at the Grand Ole Opry on his 19th birthday on July 9, 2025, which fits with him being 18 throughout most of the American Idol 2025 competition. Put simply: when viewers saw John Foster on American Idol 2025, they were watching an 18-year-old contestant.

So if you’re searching “how old is John Foster on American Idol 2025,” the answer fans and outlets consistently give is: he was 18 during the competition.

Key facts at a glance

  • John Foster was 18 years old during American Idol 2025 (Season 23).
  • He personally clarified rumors and confirmed “I am 18 years old (not 24)” while in the Top 10.
  • Coverage of his performances repeatedly refers to him as an 18-year-old country singer.
  • He turned 19 on July 9, 2025, after the main run of the season, during a Grand Ole Opry appearance.

Mini timeline

  1. Early–mid 2025: John competes on American Idol Season 23 as an 18-year-old contestant.
  1. April–May 2025: He advances into the Top 14 and then Top 10, still listed as 18.
  1. May 2025: Coverage identifies him as an 18-year-old runner-up in the finale.
  1. July 9, 2025: He performs at the Grand Ole Opry on his 19th birthday, marking his transition from 18-year-old Idol contestant to 19-year-old rising country artist.

Short forum-style take

Fans wondering “how old is John Foster on American Idol 2025?” can trust his own words and show coverage: he competed that season at 18 years old, then turned 19 a couple of months after the finale.

TL;DR: John Foster was 18 years old during American Idol 2025; he turned 19 on July 9, 2025, after the season wrapped.

Information gathered from public forums or data available on the internet and portrayed here.