Have you made your plan on getting a pregnant wife gf? There's some research that shows the quality of your sperm decreases at 35 years of age, and you're more likely to have a daughter if you impregnate a woman past that age. When you consider all the petro chemical waste we consume I wouldn't be surprised if this decrease in quality sperm happens at an even earlier age, so get your PWGF ASAP friends =)
https://www.webmd.com/infertility-and-reproduction/news/20021017/old-sperm-die-hard 