Getting Old Sucks

We went out with some friends over the weekend to celebrate one's 40th birthday. I was driving so I had very little to drink. Just one beer in the bar before dinner and another during dinner. I had soda and water the rest of the evening. I was very good. So why did I feel hung over yesterday?

I attribute it to age. I used to be able to drink a lot more and not feel nearly as bad the next day.

Hmmph!