I spent some time locating basic data on 51 Pegasi, the solar-type star that may have a planet. I found exactly eight papers published during the last 25 years that mention it. That's right, eight. There are discrepancies concerning the star's luminosity class and especially its distance. Data on the star follows.
Comments are in brackets.
It's visible to the naked eye. Because of the dispersion in the age-metallicity relation, this does NOT mean that the star is younger than the Sun. It could be older, as is Alpha Centauri, whose metallicity is also greater than the Sun's. Either way, the kinematics are unremarkable and suggest that 51 Pegasi belongs to the old thin disk, as do most nearby stars. The old thin disk ranges in age from 1 to 10 billion years.