Do you think the advice of dr.lin on the website for 2x per week max is wise? In my thinking this is correct. I recall Plato also saying something to the effect that as one ages one should taper off the sexual activity.
I think it is an decent starting point, however it all depends on your own constitution and health. Some people have stronger kidneys than others and can handle more. Yes, age is a factor, as that effects your constitution as well. In general, aged bodies are more yin deficient.
The one caveat is that Dr. Lin's estimate is for a normal human male, not one who has empowered their soul and body through daily work. I always like to frame stuff around your spiritual practices: If you find yourself getting kidney Jing deficiency symptoms (aching joints, back and knee pain, fatigue, dizziness, frustration/low motivation) this would hamper your meditative practices. If you have a strong kidney and feel like you need a release, and cannot concentrate on anything due to sexual thoughts, this would also hamper your meditative practice. In this way, it is important to find what works for you. Hopefully this would bring a harmonious relationship between you and orgasm in such a way that there would be no blockages.
The same goes for food: put enough effort into it that you feel good. If you are nutrient deficient from too much junk food, this could hamper your spiritual practices. Likewise, if you grow all your food by hand, process it all by hand, and cook each meal delicately and uniquely, you would have no time left for meditation.
Please google and familiarize yourself with kidney Jing deficiency symptoms, and as long as you avoid that, you should be fine. If you currently need help, look into jing/yin tonics. I know dragon herbs has a couple, and active herbs has yinvive. Additionally, seek help from a TCM doctor, if you need to. This may be the case for those severely weakened by porn addictions.