Yeah, that's certainly true, you can never tell ages, even with the small photo pictures. I just turned 39, though if you saw me you'd probably think I was breaking the rules on minimum age limit for this forum.
Actually, I know Will Robinson more by reputation than actually watching it. I was, however, a 'Medical Center' junkie at age 6. Dr Joe Gannon was so much a hero of mine that when I was rushed to the local E.R. with a busted nose, I argued with the nurse that I wanted Joe Gannon to treat me!