The 19-year-old is within the unmarried-under-21 range but must also satisfy the adopted-child relationship requirements to qualify; being an adult in everyday language is irrelevant. At 22, the ordinary route does not fit, though age-protection rules may be argued on a pending case. Neither result is automatic, and both turn on eligibility, not on willingness to pay.
Two children, two answers, in the same household
In this Bois-des-Filion scenario the parents would include the eligible child from the start, since initial inclusion is officially recommended for program benefits, at US$1,015,000 for that child. Later addition is neither impossible nor free, and it depends on status and eligibility at that time. For the older child, a qualified representative should look at whether any independent route exists — a family decision cannot create one.
A first review should list the intended principal and family members, confirm relationship and age records, and compare the group with the official instructions before payment. Beyond cost, each family member is vetted individually, so a spouse's prior immigration history or a child's medical record is its own admissibility question. A household of four applying together therefore faces four processing fees and, on the individual route, four times the one-million-dollar gift, subject to confirmation of current terms.