Oh my god I am soooo old...

I was sitting in the train on my way from work the other day and next to me were three blond girls with lots of make-up, aged 20. One of them said "oh my god I am turning 21 next week, I cannot believe how old I am! It's terrible!" The other girls agreed. Then one of them said "now that we are turning 21 we cannot get filthy drunk anymore like we used to - we're just going to be too old for that kind of behaviour" - the others nodded. I was just sitting there laughing quitely to myself when I thought - but if they are old when they are 21, what am I at 38- ancient? And I am not allowed to get drunk either at my age...oops!