A parson went to the dentist for a set of false teeth.
The first Sunday after he got his new teeth, he talked for only eight minutes.
On the second Sunday he talked for only ten minutes.
On the following Sunday he talked for 2 hours and 48 minutes.
The congregation had to mob him to get him down from the pulpit, and they asked him what happened.
The parson explained that on the first Sunday his gums hurt so badly that he couldn't talk for more than eight minutes. On the second Sunday his gums hurt too much to talk for more than 10 minutes. But, the third Sunday, he put his wife's' teeth in by mistake and he couldn't shut up.
To grow old is mandatory, growing up is optional.