My guess on the handles is about the late 90's. Look at the date code on the vents. It will be two letters and tell you the year of manufacture. Use this as a decoder.
As for price it really depends. If they are a color they are worth a bit more than black. You can get a new one for $49 shipped free from Amazon. Use that as a bargaining tool. If you plan to cook on them then the age and wood handles really don't make a difference. Offer $70 for both.
1998 Green Weber Performer
2000 Weber Simpsons OTG
2010 22.5 WSM
Smokin' Bucky UDS
Weber Q100, Weber Q200
1983 WGA Early 70's Red Weber Statesman
1995 Red Weber Master Touch
2010 Brick Red Touch n' Go Performer
Snap-On Wrench Smokey Joe