How can I increase cum when masterbating?

less frequent climaxing can help. just like puttin a water hose under pressure if you get excited, but don't discharge and let it go back down it can build up the final moment. Sometimes this works. However, if your doing it to pleasure a woman, then your final time may be a real quicky or partial erection before discharge from the over excitement. It is yours to play with, figure out what works for you. Some people will tell you food can effect it too.

some foods affect this...drink more water/milk

I am 47 and tryinh to make bigger and more coming out. but all the other advise is not working and in fear of suplaments