But they do THIS all the time, with the sacrament of reconciliation. I also know in the local diocese the bishop delays confirmations because of the amount of teens/adults and his insistence on being the only one that confers confirmation. The scheduling alone is bizarre.
In the case of Confirmation, there ARE time limits, set by the local bishop’s conference.
In the Case of the US, a person may be confirmed between the ages of 7 and 16, the specific age to be set by the local bishop.
In the case of my Archdiocese (Detroit), our Archbishop has set the age of Confirmation at 13 years.
Therefore, if a 13 year old has met the requirements under Canon law, they may be Confirmed during their 13th year. The bishop is under no obligation to come to their parish on their 13th birthday to Confirm them, but the bishop IS obligated to offer that Sacrament during the timeframe involved. THat might mean coming to the parish in March, April, June or May, but that is STILL within required time.
Likewise with Marriage, in the US, a pastor may defer the Marriage for 6 months to allow for Marriage preparation. After that time frame, Canon 843 takes effect.
Can. 843 §1. Sacred ministers cannot deny the sacraments to those who seek them at appropriate times, are properly disposed, and are not prohibited by law from receiving them.
The couple are no longer under any prohibition of law from receiving the Sacrament.