Arthur and Molly -- How old are they?

[vmonte]

No: HPFGUIDX 97306

I know this must have been discussed before, but, how old is Arthur 
and Molly? In GoF Molly reminisces about her school days at Hogwarts. 
In her conversation with Harry(?), the Whomping Willow was not yet at 
the school, and another man besides Hagrid was groundskeeper. If 
Hagrid's been groundskeeper for 50 years, when did Molly and Arthur 
go to school?

(Did somebody talk about this topic recently?)

They don't seem as old as Minerva?  And please don't tell me they are 
Flamel and wife............