No. CSPA and age eligibility depend on the actual immigration facts and visa availability, not simply the date funds are raised.
Use the child’s individual case chronology
Eligible derivatives generally include a qualifying spouse and unmarried child under 21, subject to applicable protection. Accompanying derivatives need no additional principal investment merely to join. A financial deadline does not automatically freeze age.
Derivative family members obtain conditional permanent residence alongside the investor rather than a dependent work restriction, so a spouse is not barred from employment in the way a temporary category's dependants can be, and children may study. A family member with a pending case can be affected by an age change or a marriage before the case concludes; someone already granted permanent residence is not automatically stripped of it because of a birthday or a wedding. Age matters more than families expect, because a child who turns twenty-one before the relevant point can fall out of the derivative class altogether; track each child's date of birth from the start rather than discovering the problem at interview. Derivative status also carries the principal's later obligations: the period of conditional residence and the filing to remove conditions reach the family too, so a household should know when that window falls before it arrives.