ID'ed again

So I was in Tesco with the hubby today went to buy him some cancer sticks (or Ciggerettes to all you smokers) and the guy behind the till was like 'Can I see some ID' I was like don't you have to be 16 to buy cigs and he was like 'no the age has gone up to 18 now' I was like you seriously wanna ID me, you won't be able to tell how old I am from my ID unless you was born in the same year as me. So I showed him my ID and he gave me the things. Anytime I go shopping with the hubby (who annoying looks around 18, but is older than me) I always get ID'ed even when we go food shopping and buy some alcohol they stop us at the check out while they're scanning and ask both of us for ID