The phrase "average when they" is not complete and lacks context, making it difficult to assess its correctness in written English.
It could be used in contexts discussing statistical averages or generalizations about a group of people or things, but it needs additional information to clarify its meaning.
Example: "People tend to be average when they are compared to their peers in similar situations."
Alternatives: "typical when they" or "standard when they".
(Interestingly, women say that they feel more disgusted on average when they see such images, but they do not secrete more skin moisture than men do.
But the back-sleepers and the stomach-sleepers started walking at the same age -- on average when they were about a year old.
Take, for instance, the effects divorce and widowhood had on women versus men: Women's household income fell by 41 percent, on average, when they divorced, which was almost twice the size of the drop that men experienced.
Outfielder Derek Bell and shortstop Pat Meares, two free-agent pickups of the past two years, epitomized the disaster, combining for a.197 batting average when they weren't hurt.
The gender pay gap for women over 40 is almost double the average when they enter management – and it gets worse as they get older, a study has found.
Both samples were about 34 years old, on average, when they enrolled in the study.
A recent analysis shows that, when American price-earnings ratios are low, returns on equities over the next decade average 8%; when they are high, returns average 3%.But people's recent losses have made them cautious.
I don't know if this means that the crooks do an average job when they steal something, or if we have the average number of thefts in our area.
For the average borrower, when they have an employer contributing an extra $100 per months, it could help your average employee get out of debt almost a decade faster".
The Surgeon General reports that in 1991 the average age when smokers tried a cigarette for the first time was 14.5 years, and the average age when they became daily smokers was 17.7 years.
Their average age when they first inhaled was 12.8 years.
