43/M feel like I can only have couple drinks and headache starts. Is it age, allergy or hydration?

Hello just curious if anyone has dealt with similar. 43 male just feel like I can’t do it anymore. I like to drink socially, especially on the golf course but man, whether is beer, super clean tequila/soda etc. after about an hour in couple drinks I can feel the headache starting. I’m just not sure if it’s age or allergy, or maybe lack of hydration. The last point could be a possibility cause my liquid diet usually consist of a 6am coffee, 11am white monster, and dinner time couple of coke zeros. I might sprinkle a bottle of water in my day but pretty rare. I just prefer taste of other options.

I assume I just can’t drink a few waters the morning of a planned social evening and expect to be fine. Maybe I need a more constant daily hydration flow 🤷🏻‍♂️.

Anyone go through something similar, and get out of it?

I know alcohol isn’t end all be all but it just helps me be a little more less reserved in social situations when my anxiety won’t let me come out of my shell. 🫤