What are some short jokes about old age?

Some subtle short jokes about old age include: "Everybody my age is getting so old" and the possibly bitter thought that "Age is just a number that determines how happy, attractive and able-bodied you are."

Less subtle short one-line jokes include: "You know you're old when by the time the last birthday cake candle is lit the first candle has burnt out;" "I'm young at heart and slightly older in other places;" and "May you live to be so old that your driving terrifies people." Self-effacing short jokes that are light-hearted include "I love asking kids what they want to be when they grow up because I’m still looking for ideas" and "I'm 63 now, but that's just 17 Celsius."