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

He can't have a boyish voice, a tenor voice and an angelic voice - that isn't possible.

2 Michael Jackson Michael Joseph Jackson was an American singer, dancer, and songwriter born on August 29, 1958, in Gary, Indiana, and passed away on June 25, 2009. He donated (at least) a remarkable 500,000,000 dollars to charity. Michael is also known as The King of Pop (a title given to him by Elizabeth Taylor) or more.

Yep. He does sound younger most of the time.

He kinda looks like a girl.

3 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 that often sounds like a kid hitting high notes but he does it incredibly good. Even now, when he's 50, he still sounds quite boy-ish AND good. I know he's got good lows, too, where he sounds manly but he doesn't use low notes very often because he's mostly a high pitch singer.

4 Zach 'Jackie' Slaughter

He's a metal singer (Skull Fist) but his voice sounds so weird for a 30 yo male that many people thought he used studio tricks to get this effect. But there are no studio tricks - the guy does sound like that.
Songs: Skull Fist - Get Fisted, Hour to Live.

5 Kellin Quinn Kellin Quinn is an American singer who is known as the lead singer of the band "sleeping with sirens".

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

6 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).

7 Matt Smith

He is 30 yo and sounds really boy-ish but he sounds good and not annoying.
example: Theocracy - I Am.

8 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. But 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

9 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's the lead singer for metal band Stratovarius).

Kinda sounds like one.

10 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 immature voice that doesn't sound very good (Rush singer)

The Contenders
11 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 more.

When he snarls he sounds very manly and it isn't boy-ish. But when he tries to really sing his voice sounds annoyingly immature and weak.

12 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.
13 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 more.
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