Final answer:
Based on typical adolescent development where romantic interests become more significant, it can be inferred that by age 18, a significant portion of young people likely have some dating experience.
Step-by-step explanation:
The question asks by what age 80% of young people have some dating experience. The context provided does not explicitly state the correct age. However, based on our knowledge about adolescence mentioned in the reference material, we can infer that during adolescence, young people become more aware of sexuality and often begin engaging in romantic relationships. Hence, by age 18, it is likely that a significant portion of adolescents have some dating experience, placing this as a potential answer to the question. It's essential to note that this is an estimation based on the understanding of adolescent development rather than explicit data on dating experience by age.