I've Never Suffered From Hay Fever, Or Seasonal Allergies, But

I've never suffered from hay fever, or seasonal allergies, but as I age, 60+, I seem to allergic to everything. I have always taken a daily medication for general allergies, but it is not enough now. Since I recently have started to take warfarin for atriel fib., could that make me more susceptible to allergies or cold virus?