The BEST age for an 80cc (OR ANY size) motocross bike is: AS OLD AS IT CAN GET AND STILL HAVE SPARE PARTS AVAILABLE. An engine can get old, but as long as it is kept running, tuned, and maintained with ORIGINAL PARTS, it can keep going beyond a person's lifetime.
1762
1902
you go to WWW.addictinggames.com
1947
mostly weight
Kawasaki
If you have the $ yes
No, acutally your supposed to start when your small but if you want to do motocross get a 250 2 stroke or a 450 4 stroke and compete in National races and get sponsored.
30 yeras old
The AMA was formed in 1924 but it wasn't until 1969 before the AMA ran its first professional motocross race.
James Stewart.