I have a 1984 XR500R and a 1976 Yamaha TT500. They both start within 2 kicks when cold. To my knowledge neither one has been rebuilt. A 28 year old bike starts like it's new, I don't think age has anything to do with ease of starting. As long as the bike is in good tune and in good mechaically condition it will fire right up regardless of age.
2004 TRX450R, HRC equipped, Yosh full system. SOLD
2003 TRX400EX
1993 Harley Davidson FXSTC
1992 Mustang GT 331 Supercharged 6-speed
1985 Mustang GT
1985 ATC250R ESR
1985 ATC350X Restored
1984 XR500R
1982 XL500R
1977 F-150 4x4 4-speed 460
1976 TT500
1966 Fairlane