Generally it depends on how prem as to how long the Premmie label lasts...

Most prems are referred to as prem in medical terms until they are about 2 years of age, by then mos thave caught up and are inline with their age.

But micro prems and very early prems the "term" lasts a lot longer, and they often are still under programs like DAP, Early Interventions etc.

DD is still referred to as a prem, and I am not sure if that will finish when she hits 2, she isn't under DAP etc but she is still seen by Paeds when she needs to and has some ongoing respiratory issues, but she is catching up, as she was very delayed in Gross Moter skills etc. But we stopped correcting her weight against her age at 1 year of age. Yet every hospital vist the first thing they have noted is ex prem

So a mixed bag really.

Some friends wee litte ones (micro prems) are still under programs at 4 years of age.

But DD will probably be referred to as a prem for a long time yet, as she will never actually stop being prem just like Kazbah said