Thunder Bolt
Silly old bat
Not invincible. I don't think many people believe that vaccination confers immortality, and I hope there aren't many who even hope that it wuld.
What the vaccine does is improve your odds. If, for example, you are an 88 year old woman, your chances of making it to this time next year are about 80% in normal times. Based on current stats, those odds have reduced to 79%.
She knows that if she continues to hide at home and shun her friends, her social life, and her family, she can improve her chances of living another year from 79% to 80%. If she chooses to ignore the risk and goes out living her life, it isn't because she believes herself to be immortal. It's because she thinks the increased risk of death is a price worth paying for the increased enjoyment of life.
It's similar odds at all age groups. If your chances of death in normal times are 1%, then it rises to 1.05% or so. It's a matter of whether the increased risk is worth the extra enjoyment of life. Sometimes we do things (like driving, for example) that we know carries a risk, but which we choose to ignore because it's a low enough risk.
There are ways of driving which mean low risk and reckless driving.