by the time

1 - By the time children are around 12 years old, many will begin to ask if they can go out to the local park, playground or stores to spend time with their friends without adult supervision.

2 - By the time the rescue team arrived, the old wooden house had been virtually destroyed by the massive forest fire.

3 - By the time a person reaches adulthood, he achieves a sense of identity and is ready to share it with others by forming intimate relationships based on love and commitment.
Bir kişi yetişkinliğe ulaştığında, kimlik duygusu kazanır ve sevgi ve bağlılık temeline dayalı yakın ilişkiler kurarak bunu başkalarıyla paylaşmaya hazırdır.