RESEARCH QUARTERLY

Bowling Congress champions. The dash line in Figure 11 sets forth
analogous data for 90 women champions. The women’s age curve rises
and descends five years earlier than does the curve for the men. The
peak for the men’s curve occurs at ages 30 to 34 inclusive, the apogee
for the women’s curve occurs at ages 25 to 29 inclusive. Of interest in
this connection is the fact that, when a fecundity age curve was plotted
for women, its highest point occurred five years earlier than did the
highest point of the age curve for male fecundity (see Figure 10).

PROFESSIONAL BILLIARDISTS

In the July, 1934, issue of the Billiards Magazine is a list of the birth
dates of more than 1oo noted billiardists.2 Supplementary lists have
been published subsequently in the same magazine. Menke’s Ali Sports
Record Book for 1935 gives the years during which various billiardists
were champions and also the years during which various professional
world billiard records were broken.” In studying the billiardists, as in
studying the other performers that are mentioned herein, one credit was
assigned to a given age group if a billiardist of that particular age
group broke a world record. If the same individual broke world
records at several different age levels, one credit was allotted to each
appropriate group. If a given player broke three world records during
a single year, three credits were allotted to his age group.

In Figure 12 the dash line reveals the chronological ages at which

 

Worn —— ——__ World Records —— —— —

Ken ————______ Worlé Championships

 

 

 

 

 

 

\ rs t 1

i i i.
15 20 25 30 35 40 45 50 55 60

 

 

Ficure 11. Ages at which National Ficure 12. A, chronological ages at
Duck Pin Bowling Championships were which 136 professional world cham-
won or retained. A, women bowlers; pionships at billiards were won or re-
B, men bowlers. tained; B, ages at which 42 world

records were established.