Abstinence: Semen is made and stored in the seminal vesicles. Some is also made by the prostate. The sperm cells which are made in the testes are not mixed with the seminal fluid until just before ejaculation. This assures "fresh" spermatozoa (and not old/dead ones as you fear.
Answered 10/21/2017
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Constant production: Sperm are generated constantly from the stem cells in the testis and anytime you decide to have sex there will be fresh ones ready to do their job. It only takes one, and after entering your system the healthiest ones are the best swimmers. The can fertilize an egg for several days after entry.
Answered 11/27/2017
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