Should there be a retirement age set for MPs?

Now this kind of proves what do I know about any given subject? I thought it was a shoe in for people to say MPs should have a retirement age like the rest of us. Then again as I don't know who out of the 89 who answered actually were. The responders could have been 61% of people with a vested interest. It was just a straw poll.

As the link shows on the tweet, 22 people who were elected are over 70 some over 80. Yes! it is great to have life skills and knowledge but do they have their full faculties to share and use them?