They are a celebration of our life; of that moment we took our first air breath; of that moment we affirmed ourselves. Celebrate them with all your person. Do something that belongs to you for that entire day. If you wish, share it with those you love: your partner, your friends, your children, whomever you wish, but thrill to that day. The times you will celebrate are unknown, but they are not infinite. Einstein said that closed spaces without limits are conceivable and I say he was talking about birthdays.