They were younger , just young enough to be let out of the house on a Friday night by their parents and were letting it go to their heads . One of the girls lit up a smoke in a train carriage . As it started clouding around her head I thought " Is she really fucking doing that ?

Question: What may be a plausible fact about their age ?
Answer: They are young adults .They are pre - pubescent .They are toddlers .They are high schoolers .