By the time they reached adulthood, the California dairy industry was in transition and a different, much larger, industrial type of dairy farm had begun to spread itself on the land. (strausfamilycreamery.com)
Although identical twins have the same genes as each other, their epigenomes — the collection of methyl marks studding their DNA — are different by the time they reach adulthood due in part to environmental factors. (sciencedaily.com)
By the time we reach adulthood, we are snap - judgement specialists, jumping to conclusions about a person's character and status after seeing their face for just a tenth of a second. (newscientist.com)