I'd say for myself as a 50yo cuckold that masturbates a LOT, and have done all my life. When my wife is fucking someone and more so if he's a regular thing, the sperm competition kicks in for me, and I definitely start producing a lot more cum, and so I then need to jerk off more which means I then produce even more again. In those moments, I think I can match the quantity with any bull. But if she isn't seeing anyone and life is a little routine, it would be lucky to be a few watery drops.
The days of squirting any sort of distance for me are over. If i'm cumming into my other hand it would rarely shoot past the palm of my hand. Yet when I was younger, could easily squirt directly in my own mouth and face without even trying.