What is a good age for marriage?

So I am a 25 y/o, I am an Asian guy and currently I am aiming to finish my Master, my school and work life are taking over my life. I currently am an electrical engineer for one of an automation company so my life is super busy 🙁 on top of that, I hand to study for my professional engineer license and trying to finish my MS degree, well no need to get into much details. With the current situation of COVID-19, I will have to be in quarantine, I mean I've always been in quarantine most part of my life lol.

I feel like once everything is done, I am gonna be like an old man. Thinking about this is making me sad.