The phrase "although the average age" is correct and usable in written English.
It can be used to introduce a contrast or exception regarding the average age in a discussion or analysis.
Example: "Although the average age of participants was 30, many of them had extensive experience in the field."
Alternatives: "even though the typical age" or "despite the mean age".
At 40 I'm almost never the oldest, although the average age is younger.
The studies included people ages 18 and older, although the average age in most of the studies was under 40.
Although the average age at the Hartford Bridge Club is in the early 60's, the club also has teenage members.
Although the average age of women has increased from 50 to nearly 85 years, the average age at menopause has remained essentially constant at 50 years.
He was pleased to find a functioning synagogue nearby, although the average age of the congregants was, he says, "about 60".
"We were reaching a huge number of millennial women at Bustle, and we realized that although the average age of first birth is twenty-six years old, there is no millennial-focussed parenting site," she said.
Whenever possible, every attempt was made to enroll as many siblings per family as possible - although given the average age of the subjects (65.5 years), in some instances certain siblings were either too ill or deceased and could not participate.
Although it seems that the average age of the online shopper is in their early 20's, according to experts the age is actually 32-45.
The association with age may be related to the fact that most of the evidence for fracture prevention with SERMs has come from trials performed in younger women, although it should be noted that the average age of participants in the positive MORE study in vertebral fracture was 67 years [ 17].
Although the proportion of men, and the average age, body weight and body mass index were comparable between groups, patients with CHF had significantly worse resting pulmonary function and lower peak aerobic capacity during the CPET than healthy peers (Table 1).
I brighten when I think of the average age as eighty-six, although I have plans to go on much longer than that — bypassing Mischa Richter at ninety, Syd Hoff at ninety-one, George Price at ninety-three, and William Steig at ninety-five.
