Top 25 WW1 aces and their ages

Name	Age
1.Manfred von Richthofen	25 when killed
2.René Fonck	24 at end of war
3.Edward Mannock	30 when killed
4.Billy Bishop	24 at end of war
5.Ernst Udet	22 at end of war
6.Raymond Collishaw	24 at end of war
7.James McCudden	23 when killed
8.Andrew Beauchamp-Proctor	24 at end of war
9.Erich Loewenhardt	21 when killed
10.Donald MacLaren	25 at end of war
11.Georges Guynemer	22 when killed
12.William George Barker	24 at end of war
13.Josef Jacobs	24 at end of war
14.Werner Voss	20 when killed
15.Robert A. Little	23 when killed
16.George McElroy	25 when killed
17.Fritz Rumey	27 when killed
18.Albert Ball	20 when killed
19.Rudolph Berthold	27 at end of war
20.Bruno Loerzer	27 at end of war
21.Paul Bäumer	22 at end of war
22.Tom F. Hazell	26 at end of war
23.Charles Nungesser	26 at end of war
24.Georges Madon	26 at end of war
25.Oswald Boelcke	25 when killed

Order as per Wikipedia. It was going to be the top 20 until I noticed I could get Nungesser and Boelcke on there too.

Edward Mannock was the oldest of this group, at 30. He was an exceptional pilot in a lot of ways, not least with the amount of effort he devoted to ensuring that the younger pilots under his command (who knew him simply as "Mick") were properly schooled in how to survive. His devotion to his comrades manifested as an intense hatred of German pilots, and his actions and beliefs were a stark contrast to the perception of the First Air War as chivalrous.

Albert Ball and Werner Voss are the youngest listed, both aged 20 when they were killed.

Voss was a close friend and rival of Manfred von Richthofen. His final dogfight became legendary, as he single-handedly held off a squadron of planes led by James McCudden, before finally being shot down. "His flying was wonderful," McCudden said of Voss, "his courage magnificent and in my opinion he is the bravest German airman whom it has been my privilege to see fight."

Ball was a loner who was valued highly for his propaganda value. He spent his time on the ground gardening by himself, and the letters he wrote home showed a young man struggling with the repressive nature of his role, and his growing unhappiness at killing so many pilots. He crashed while pursuing the Red Baron's brother, Lothar von Richthofen, although it's unclear who (if anyone) shot him down.