Do you think 68 years old is too old ? Most definitely not ! I have found some great starter videos online for tuning, bowing etc. With earlier training on piano, clarinet and flute, I am finding the cello the most rewarding instrument I have ever touched. I love the resonance that seems to permeate the mind and body.
Next task...finding an instructor in a rural area. (gulp)
yup i am 12 and i started when i was about 10-11....
i'm pretty good now :D
when i started everyone said it was too late but my teacher said starting late was better than starting early
good luck, and happy playing!