Well... Yes and no. Eggs are formed in utero and stay in a state of proto development or .... I can’t remember the term exactly. Let’s call it suspended hibernation and I’ll trust that if you’ve ever watched or read sci-fi much at all you’ll know what I’m saying here. However many proto eggs your ovaries contain when you’re born is what you have to work with. You can never grow more but they don’t age in the same way that your other cells do. Their aging process is much slower.

Sperm on the other hand, are continually created throughout life from puberty. So they don’t age like eggs do, they age more like your regular cells do. Sperm take about 72 days to form, 14 days to move to the ejaculate, and can live for an average of 5 days once ejaculated.

If you were to compare… the lifespan of a sperm compared to an egg, it’s more like a mayfly to a Galapagos tortoise. They’re aging much much faster.

What does age is the entire apparatus that makes the sperm. That’s going to be the testicles, obviously, but also the entire supply chain of body resources that "feeds" the factory, so to speak, using a manufacturing analogy for the human body. So, the brain and your entire cellular structure that makes anything needed to produce that sperm, be it your digestive system that provides the fuel your factories run off of, your endocrine system which provides the protein components necessary to build a sperm, your circulatory system which handles logistical support getting product into and out of the factory, etc. If any bit of that is compromised, the final product is of lesser quality and quantity than when your body as a whole was humming along more efficiently due to youth.