Frozen semen is viable for decades. IVF is effective in most cases especially if the woman didn’t have a need for IVF and was perfectly healthy to begin with. Rich guys freeze sperm and get vasectomy to stop golddiggers it’s common knowledge that the young rich men do this.
Do you trust a sperm bank to properly store your semen for 25 years and give you back your sperm on demand? Have you read all the stories of sperm banks screwed up? The old fashioned sperm quality control methods usually work better.