Top 10 Adult Male Singers with Boy-ish Voices

I mean adult male singers that are, say, older than 20 but their voices sound as if they didn't mature enough and will never sound very manly. This effect of a "boy-ish voice" is usually created by singers with high and thin voices, or singers who often use falsetto.

Hammerfall singer Joacim Cans said about the falsetto "You just have to find your "child" voice and do exercises using that voice."
Similarly to this, some singers probably find and use their pre-puberty voices even when they don't use falsetto.

And last but not least, people's voices are genetically stored as a code in the DNA.

A boy-ish voice doesn't mean the singer is bad. And it doesn't mean the boy-ish voices can't sound good - there are 3 types of singers in this category:
1) boy-ish voices that sound very good
2) boy-ish voices that are OK
3) boy-ish voices that sound bad.
The Top Ten
1 Dimash Kudaibergen
2 Michael Kiske Michael Kiske is a singer best known as the former lead vocalist for the German power metal band Helloween.

(singer for Helloween, Avantasia, Unisonic).

He's an example of a good sounding boy-ish voice that has enough power. Michael Kiske is a great metal singer who often sounds like a kid hitting high notes, but he does it incredibly well. Even now, at 50, he still sounds quite boy-ish and good. I know he has good lows too, where he sounds manly, but he doesn't use low notes very often because he's mostly a high pitch singer.

3 Zach 'Jackie' Slaughter

He's a metal singer (Skull Fist) but his voice sounds so unusual for a 30-year-old male that many people thought he used studio tricks to achieve this effect. However, there are no studio tricks. The guy really does sound like that.
Songs: Skull Fist - Get Fisted, Hour to Live.

4 Justin Bieber Justin Drew Bieber (born March 1, 1994) is a Canadian singer, songwriter, and record producer. He currently resides in Ontario, Canada and is Christian. He is the son of author Pattie Mallette... read more
5 Kellin Quinn Kellin Quinn Bostwick, born on April 24, 1986, is an American singer and musician. He is best known as the lead singer and keyboardist of the post-hardcore band "Sleeping with Sirens"... read more

He provides lead vocals for Sleeping with Sirens and he sounds really boy-ish. An example is the song "Go Go Go," a song from 2015 when he was 29. His voice is more boy-ish than Kiske's, but Kiske ranks higher because he's a better singer.

6 Michael Jackson Michael Jackson (Michael Joseph Jackson; August 29, 1958 – June 25, 2009) was an American singer, dancer, and songwriter. He passed away from cardiac arrest caused by a propofol and benzodiazepine overdose on June 25, 2009. He donated (at least) a remarkable 500,000,000 dollars to charity. Michael... read more

Yes, he does sound younger most of the time.

7 Tory Lanez Daystar Peterson, better known by his stage name Tory Lanez, is a Canadian rapper and singer. He received major recognition from the mixtape Lost Cause and the singles, "Say It," and "Luv", which peaked at number 23, and 19 on the Billboard Hot 100 respectively.
8 Barry Gibb Barry Alan Crompton Gibb is a British singer, songwriter and record producer who rose to worldwide fame as a co-founder of the group Bee Gees, one of the most commercially successful and critically acclaimed groups in the history of popular music.

(The Bee Gees singer)
He sounds boy-ish because he usually uses falsetto (R&B falsetto, in particular).

9 Eric Bellinger Eric Bellinger, Jr., born March 26, 1986, is an American singer, songwriter, and record producer from Los Angeles, California.
10 Jeremih Jeremih Felton, better known by his mononym Jeremih, is an American singer, songwriter, and record producer. In 2009, he signed a record deal with Def Jam Recordings.
The Contenders
11 Matt Smith

He is 30 years old and sounds really boy-ish, but he also sounds good and not annoying.
Example: Theocracy - I Am.

12 Lloyd
13 Tim Charles

Singer for metal band Ne Obliviscaris with a very clean and beautiful voice. His falsetto is awesome too. He sounds like an angel, and when I heard his falsetto in the song below (chorus), I thought it was a female opera singer. However, he isn't very high on this list because his voice is less "boy-ish" than the voices of some other singers.

Song: Ne Obliviscaris - Urn (Part I) - And Within the Void We Are Breathless

14 The Weeknd Abęl Makkonen Tesfaye, known professionally by his stage name The Weeknd, is a Canadian singer, songwriter, and record producer. He was born on 16 February 1990 in Toronto, Ontario... read more
15 Timo Kotipelto Timo Antero Kotipelto is the vocalist of the Finnish power metal band Stratovarius and is the creator and vocalist of the power metal band Kotipelto.

He's a good singer with a very high and thin voice that makes it sound "boy-ish." He is the lead singer for the metal band Stratovarius.

16 The-Dream Terius Youngdell Nash, better known by his stage name The-Dream, is an American singer, songwriter and record producer.
17 Geddy Lee Gary Lee Weinrib, known professionally as Geddy Lee, is a Canadian musician, singer and songwriter best known as the lead vocalist, bassist, and keyboardist for the Canadian rock group Rush.

An example of an immature voice that doesn't sound very good (Rush singer).

18 Chris Brown Christopher Maurice "Chris" Brown (born May 5, 1989) is an American singer, songwriter, dancer and actor. Born in Tappahannock, Virginia, he was involved in his church choir and several local talent shows from a young age. He is most well known for his physical assault towards the singer Rihanna in... read more
19 Babyface
20 Dave Mustaine David Scott "Dave" Mustaine (born September 13, 1961) is an American musician, singer, songwriter, actor and author. Mustaine is best known as a pioneer in Thrash Metal, being the former lead guitarist of Metallica before his dismissal in 1983, leading to finding and becoming the front man of his own... read more

When he snarls, he sounds very manly and not boy-ish. But when he tries to really sing, his voice sounds annoyingly immature and weak.

21 Ralph Tresvant
22 Jimin
23 Adam Lambert Adam Mitchel Lambert is an American singer, songwriter and stage actor. Since 2009, he has sold over 2.5 million albums and 5 million singles worldwide.
24 Daron Malakian Daron Vartan Malakian is an Armenian–American singer-songwriter, multi-instrumentalist, and record producer. He's best known as the main songwriter, guitarist, and co-vocalist for Armenian/American rock band System of a Down. After System of a Down's hiatus in 2006 he began to release music through... read more
25 Evan Taubenfeld Evan David Taubenfeld is an American singer and musician, best known for being Avril Lavigne's lead guitarist, music director and frequent collaborator.
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