"You know you're getting old when you get that one candle on the cake. It's like, 'See if you can blow this out.'"

This quote by Jerry Seinfeld is an amusing way of pointing out the inevitability of aging. He is recommending that when you grow older, you are presented with a single candle light on your birthday celebration cake, as if to challenge you to see if you can still blow it out. This is an amusing method of acknowledging that as we age, our physical capabilities decline as well as we come to be much less efficient in doing the important things we used to do. Seinfeld is additionally recommending that aging is a natural part of life and that we must accept it with a sense of humor. He is indicating that although we might not be able to do the very same things we made use of to do, we can still locate pleasure in the simple things in life.